Senator John Cornyn, the second-ranking Senate Republican who has in recent weeks become a more outward defender of President Donald Trump, and acting FBI director Andrew McCabe, who on Thursday contradicted the Trump White House on a range of topics, will interview Saturday to serve as the FBI's permanent director, according to people familiar with the matter.

The men are two of at least four people who will interview to replace James Comey, whom Mr Trump suddenly fired earlier this week, the people said.

The others are Alice Fisher, a white-collar defence lawyer who previously led the Justice Department's criminal division, and Michael Garcia, a judge on the New York State Court of Appeals who previously served as the U.S. attorney for the Southern District of New York.

All four will be interviewed by Attorney General Jeff Sessions and Deputy Attorney General Rod Rosenstein, the two top officials in the Justice Department.

The list is not a comprehensive accounting of finalists for the FBI director positions. It is possible other candidates could be considered, officials said, and the ultimate decision falls to Trump. Justice Department officials also have interviewed four other candidates to serve as interim FBI director, though it is possible Mr McCabe could stay on in that role if he were not selected for the permanent job.

The job also requires Senate confirmation. Whoever is selected is appointed to a 10-year term, though they can be removed by the president.

Trump's sudden removal of Mr Comey from the position this week set off a political firestorm in Washington, fuelling fears that the president was trying to stifle the bureau's probe into possible coordination between his campaign and Russia to influence the outcome of the 2016 election.

Trump acknowledged in an interview with NBC News published Thursday he was thinking of the Russia controversy when he decided to fire Mr Comey. Previously, White House officials said he was acting on the recommendation of the top Justice Department officials, particularly a memo from Rosenstein that had criticised Mr Comey for his handling of the investigation into former secretary of state Hillary Clinton's use of a private email server.

Trump said, though, that he would have removed Mr Comey no matter the advice from Mr Rosenstein or Mr Sessions.

Mr Cornyn, 65, is a former Texas attorney general and state supreme court justice and is serving his third term in the Senate. He serves as Senate majority whip, making him the second-ranking Republican in the chamber. But GOP senators set term limits for leadership posts and his ends at the start of 2019.

The biggest names involved in the Trump-Russia investigation Show all 17 1 /17 The biggest names involved in the Trump-Russia investigation The biggest names involved in the Trump-Russia investigation Paul Manafort Mr Manafort is a Republican strategist and former Trump campaign manager. He resigned from that post over questions about his extensive lobbying overseas, including in Ukraine where he represented pro-Russian interests. Mr Manafort turned himself in at FBI headquarters to special counsel Robert Mueller’s team on Oct 30, 2017, after he was indicted under seal on charges that include conspiracy against the United States, conspiracy to launder money, unregistered agent of a foreign principal, false and misleading US Foreign Agents Registration Act statements, false statements, and seven counts of failure to file reports of foreign bank and financial accounts. Getty The biggest names involved in the Trump-Russia investigation Rick Gates Mr Gates joined the Trump team in spring 2016, and served as a top aide until he left to work at the Republican National Committee after the departure of former Trump campaign manager Paul Manafort. Mr Gates' had previously worked on several presidential campaigns, on international political campaigns in Europe and Africa, and had 15 years of political or financial experience with multinational firms, according to his bio. Mr Gates was indicted alongside Mr Manafort by special counsel Robert Mueller's team on charges that include conspiracy against the United States, conspiracy to launder money, unregistered agent of a foreign principal, false and misleading US Foreign Agents Registration Act statements, false statements, and seven counts of failure to file reports of foreign bank and financial accounts. AP The biggest names involved in the Trump-Russia investigation George Papadopoulos George Papadopoulos was a former foreign policy adviser for the Trump campaign, having joined around March 2016. Mr Papadopoulos plead guilty to federal charges for lying to the FBI as a part of a cooperation agreement with Special Counsel Robert Mueller's investigation. Mr Papadopoulos claimed in an interview with the FBI that he had made contacts with Russian sources before joining the Trump campaign, but he actually began working with them after joining the team. Mr Papadopoulos allegedly took a meeting with a professor in London who reportedly told him that Russians had "dirt" on Hillary Clinton. The professor also allegedly introduced Mr Papadopoulos to a Russian who was said to have close ties to officials at the Russian Ministry of Foreign Affairs. Mr Papadopoulos also allegedly was in contact with a woman whom he incorrectly described in one email to others in the campaign as the "niece" to Russian President Vladimir Putin. Twitter The biggest names involved in the Trump-Russia investigation Donald Trump Jr The President's eldest son met with a Russian lawyer - Natalia Veselnitskaya - on 9 June 2016 at Trump Tower in New York. He said in an initial statement that the meeting was about Russia halting adoptions of its children by US citizens. Then, he said it was regarding the Magnitsky Act, a US law blacklisting Russian human rights abusers. In a final statement, Mr Trump Jr released a chain of emails that revealed he took the meeting in hopes of getting information Ms Veselnitskaya had about Hillary Clinton's alleged financial ties to Russia. He and the President called it standard "opposition research" in the course of campaigning and that no information came from the meeting. The meeting was set up by an intermediary, Rob Goldstone. Jared Kushner and Paul Manafort were also at the same meeting. Getty Images The biggest names involved in the Trump-Russia investigation Jared Kushner Mr Kushner is President Donald Trump's son-in-law and a key adviser to the White House. He met with a Russian banker appointed by Russian President Vladimir Putin in December. Mr Kushner has said he did so in his role as an adviser to Mr Trump while the bank says he did so as a private developer. Mr Kushner has also volunteered to testify in the Senate about his role helping to arrange meetings between Trump advisers and Russian Ambassador to the US Sergey Kislyak. Getty Images The biggest names involved in the Trump-Russia investigation Rob Goldstone Former tabloid journalist and now music publicist Rob Goldstone is a contact of the Trump family through the previously Trump-owned 2013 Miss Universe pageant, which took place in Moscow. In June 2016, he wrote to Donald Trump Jr offering a meeting with a Russian lawyer, Natalya Veselnitskaya, who had information about Hillary Clinton. Mr Goldstone was the intermediary for Russian pop star Emin Agalaraov and his father, real estate magnate Aras, who played a role in putting on the 2013 pageant. In an email chain released by Mr Trump Jr, Mr Goldstone seemed to indicate Russian government's support of Donald Trump's campaign. AP images The biggest names involved in the Trump-Russia investigation Aras and Emin Agalarov Aras Agalarov (R) is a wealthy Moscow-based real estate magnate and son Emin (L) is a pop star. Both played a role in putting on the previously Trump-owned 2013 Miss Universe pageant in Moscow. They allegedly had information about Hillary Clinton and offered that information to the Trump campaign through a lawyer with whom they had worked with, Natalia Veselnitskaya, and music publicist Rob Goldstone. Getty Images The biggest names involved in the Trump-Russia investigation Natalia Veselnitskaya Natalia Veselnitskaya is a Russian lawyer with ties to the Kremlin. She has worked on real estate issues and reportedly counted the FSB as a client in the past. She has ties to a Trump family connection, real estate magnate Aras Agalarov, who had helped set up the Trump-owned 2013 Miss Universe pageant which took place in Moscow. Ms Veselnitskaya met with Donald Trump Jr, Jared Kushner, and Paul Manafort in Trump Tower on 9 June 2016 but denies the allegation that she went there promising information on Hillary Clinton's alleged financial ties to Russia. She contends that the meeting was about the US adoptions of Russian children being stopped by Moscow as a reaction to the Magnitsky Act, a US law blacklisting Russian human rights abusers. Getty Images The biggest names involved in the Trump-Russia investigation Mike Flynn Mr Flynn was named as Trump's national security adviser but was forced to resign from his post for inappropriate communication with Russian Ambassador to the US Sergey Kislyak. He had misrepresented a conversation he had with Mr Kislyak to Vice President Mike Pence, telling him wrongly that he had not discussed sanctions with the Russian. Getty Images The biggest names involved in the Trump-Russia investigation Sergey Kislyak Mr Kislyak, the former longtime Russian ambassador to the US, is at the centre of the web said to connect President Donald Trump's campaign with Russia. Reuters The biggest names involved in the Trump-Russia investigation Roger Stone Mr Stone is a former Trump adviser who worked on the political campaigns of Richard Nixon, George HW Bush, and Ronald Reagan. 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Mr Page met with Russian Ambassador to the US Sergey Kislyak during the 2016 Republican National Convention in Cleveland. Mr Page had invested in oil companies connected to Russia and had admitted that US Russia sanctions had hurt his bottom line. Reuters The biggest names involved in the Trump-Russia investigation Jeffrey "JD" Gorden Mr Gordon met with Russian Ambassador to the US Sergey Kislyak during the 2016 Republian National Convention to discuss how the US and Russia could work together to combat Islamist extremism should then-Republican presidential candidate Donald Trump win the election. The meeting came days before a massive leak of DNC emails that has been connected to Russia. Creative Commons The biggest names involved in the Trump-Russia investigation James Comey Mr Comey was fired from his post as head of the FBI by President Donald Trump. The timing of Mr Comey's firing raised questions around whether or not the FBI's investigation into the Trump campaign may have played a role in the decision. Getty Images The biggest names involved in the Trump-Russia investigation Preet Bharara Mr Bahara refused, alongside 46 other US district attorney's across the country, to resign once President Donald Trump took office after previous assurances from Mr Trump that he would keep his job. Mr Bahara had been heading up several investigations including one into one of President Donald Trump's favorite cable television channels Fox News. Several investigations would lead back to that district, too, including those into Mr Trump's campaign ties to Russia, and Mr Trump's assertion that Trump Tower was wiretapped on orders from his predecessor. Getty Images The biggest names involved in the Trump-Russia investigation Sally Yates Ms Yates, a former Deputy Attorney General, was running the Justice Department while President Donald Trump's pick for attorney general awaited confirmation. Ms Yates was later fired by Mr Trump from her temporary post over her refusal to implement Mr Trump's first travel ban. She had also warned the White House about potential ties former National Security Adviser Michael Flynn to Russia after discovering those ties during the FBI's investigation into the Trump campaign's connections to Russia. Getty Images

Mr Cornyn is not expected to challenge Senate Majority Leader Mitch McConnell, who is not term-limited and is widely respected among Republican senators. That means Mr Cornyn is on the verge of hitting a professional ceiling, so the 10-year term of FBI director might be a logical next move.

If Mr Cornyn were selected, there likely would be Democratic concern about handing over the nation's premier law enforcement agency to a Republican who - despite being considered an affable senator - has served as a prominent partisan attack dog.

Mr Cornyn has in recent weeks become more of an outward defender of Mr Trump. Earlier this week, he dismissed the idea that Mr Trump fired Mr Comey to impede the FBI's Russia probe, terming it a "phony narrative."

"If you assume that, this strikes me as a lousy way to do it," he said. "All it does is heighten the attention given to the issue."

The senator's confirmation would be assured because of Democratic rules changes in 2013 that only require a simple majority. But Democratic strategists have already put senators on notice they would hold their feet to the fire in voting against Mr Cornyn.

Spokespeople for Mr Cornyn did not immediately respond to emails Friday night. Asked previously if he would be willing to serve as FBI director, Mr Cornyn said with a smile, "I'm happy serving my state and my country in my present position."

One person familiar with Mr Cornyn's thinking told The Washington Post that his meeting with Mr Sessions on Saturday was not billed as an interview and instead about the "next steps" for the FBI.

Mr Cornyn was scheduled to deliver the commencement address Saturday at Texas Southern University in Houston, but university officials on Friday cancelled his appearance at the historically black college after a petition signed by hundreds of students protested his appearance.

Donald Trump's first 100 days: in cartoons Show all 33 1 /33 Donald Trump's first 100 days: in cartoons Donald Trump's first 100 days: in cartoons Donald Trump's first 100 days in office were marred by a string of scandals, many of which caught the eye of the Independent's cartoonists Donald Trump's first 100 days: in cartoons Trump's first 100 days have seen him aggressively ramp up tensions with his nuclear rivals in North Korea Donald Trump's first 100 days: in cartoons Mr Trump has warned of a "major, major conflict" with the pariah nation lead by Kim Jong Un Donald Trump's first 100 days: in cartoons Mr Trump dropped the "mother of all bombs" on alleged ISIS-linked militants in Afghanistan, amid an escalation of US military intervention around the globe Donald Trump's first 100 days: in cartoons Mr Trump has been accused of falling short of the standards set by his predecessors in the Oval Office, including Franklin D Roosevelt Donald Trump's first 100 days: in cartoons The tycoon's ascension to the White House came at a time when the balance of power is shifting away from Western nations like those in the G7 group Donald Trump's first 100 days: in cartoons Western politicians, including the British Conservative party, have been accused of falling in line behind Mr Trump's proposals Donald Trump's first 100 days: in cartoons Brexit is seen to have weakened Britain, reducing still further any political will to resist American leadership Donald Trump's first 100 days: in cartoons Mr Trump's leadership has been marked by sudden and unexpected shifts in global policy Donald Trump's first 100 days: in cartoons Trump's controversial missile strike on Syria, which killed several citizens, was seen by some analysts as an attempt to distract from his policy elsewhere Donald Trump's first 100 days: in cartoons The President has also spent a large majority of his weekends golfing, rather than attending to matters of state Donald Trump's first 100 days: in cartoons Though free of gaffes, a visit from Chinese president Xi Jinping spotlighted trade tensions between the two states Donald Trump's first 100 days: in cartoons One major and unexpected setback came when Mr Trump's Healthcare Bill was struck down by members of his own party Donald Trump's first 100 days: in cartoons Mr Trump has been a figure of fun in the media, with his approval at record lows Donald Trump's first 100 days: in cartoons A string of revelations about Mr Trump's financial indiscretions did not mar his surge to the White House Donald Trump's first 100 days: in cartoons Outgoing President Barack Obama was accused of wiretapping Trump Tower by his successor in America's highest office Donald Trump's first 100 days: in cartoons The alleged involvement of Russian intelligence operatives in securing Mr Trump the presidency prompted harsh criticism Donald Trump's first 100 days: in cartoons The explosive resignation of Security Adviser Michael Flynn, who lied about his links to 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The university said it asked Mr Cornyn to visit at a later date. The senator's office said on Friday that he respected the decision and looked forward to visiting in the future.

Mr McCabe, who had been the FBI deputy director before Mr Comey was fired, might be a more palatable choice for Democrats. At a Senate Intelligence Committee hearing Thursday, he heaped praise on his former boss and did not hesitate to rebut narratives advanced by the White House, including its attempt to minimise the Russia probe. He is a longtime FBI agent who led the Washington Field Office before he was elevated to the bureau's No. 2 post in 2016.

Through an FBI spokesman, he declined to comment.

Ms Fisher and Mr Garcia are both alumni of the George W. Bush administration. Mr Garcia served as assistant secretary for Immigration and Customs Enforcement and as the U.S. attorney for the Souther District of New York, where he led the investigation into a prostitution ring that ultimately forced New York Gov. Eliot Spitzer to resign.

Ms Fisher served as an assistant attorney general, and, if selected, would be the first woman to run the FBI.

Efforts to reach both of them were not successful on Friday night.