President Donald Trump said Monday that House Speaker Nancy Pelosi has lost control of her caucus and Rep. Ilhan Omar, a Muslim congresswoman from Minnesota, is running the show.

As he prepared to fly to Omar's home state for a Tax Day event, the president called the Minnesota Democrat an 'anti-Semite' and claimed she's 'ungrateful' in a tweet that questioned the Somalian-born lawmaker's loyalty to the United States.

'Before Nancy, who has lost all control of Congress and is getting nothing done, decides to defend her leader, Rep. Omar, she should look at the anti-Semitic, anti-Israel and ungrateful U.S. HATE statements Omar has made. She is out of control, except for her control of Nancy!' he claimed.

Omar and her family applied for asylum and relocated to the U.S. in the mid-90's. She became a U.S. citizen as a teen.

She said Monday in a tweet as he arrived in Minnesota that her state is so welcoming to immigrants they put one in Congress, as she clapped back at the U.S. president who wants to dramatically lower the number of refugees the country takes in.

'The Great State of Minnesota, where we don’t only welcome immigrants, we send them to Washington,' she told him.

President Donald Trump said Monday that House Speaker Nancy Pelosi has lost control of her caucus and Rep. Ilhan Omar, a Muslim congresswoman from Minnesota, is running the show

Pelosi on Sunday called on President Donald Trump to remove a 'dangerous' video from his Twitter feed that was critical of Omar. Democrats claim it brought threats of violence against the congresswoman

Omar and her family applied for asylum and relocated to the U.S. in the mid-90's. She became a U.S. citizen as a teen

As he prepared to fly to Omar's home state for a Tax Day event, the president called the Minnesota Democrat an 'anti-Semite' and claimed she's 'ungrateful' in a tweet that questioned the Somalian-born lawmaker's loyalty to the United States

The tweets were the latest chapter in the battle between Trump and Omar, and Pelosi and Trump, which picked back up Friday when the U.S. president tweeted a video of the Democratic lawmaker referring to 9/11 attackers as 'people' rather than terrorists during a fundraiser for the Council of American-Islamic Relations.

Pelosi said Sunday that Trump should remove the 'dangerous' video from his Twitter feed, following Rep. Alexandria Ocasio-Cortez's lead. Democrats say Trump's video brought threats of violence against Omar.

'The President's words weigh a ton, and his hateful and inflammatory rhetoric creates real danger. President Trump must take down his disrespectful and dangerous video,' Pelosi said in a statement from London, where she is on travel with lawmakers.

She said she asked Capitol Police to investigate threats of violence against the freshman legislator.

'Following the President's tweet, I spoke with the Sergeant-at-Arms to ensure that Capitol Police are conducting a security assessment to safeguard Congresswoman Omar, her family and her staff. They will continue to monitor and address the threats she faces,' Pelosi said.

The video had been pinned to the top of Trump's feed. He had removed it by the time the altercation escalated on Monday.

'WE WILL NEVER FORGET,' the president said in a Friday night tweet that accompanied a 43-second video of the Twin Towers burning down on September 11, 2001 and a clip of Omar's comments at the CAIR fundraiser.

She said Monday in a tweet as he arrived in Minnesota that her state is so welcoming to immigrants they put one in Congress, as she clapped back at the U.S. president who wants to dramatically lower the number of refugees the country takes in

Speaker Pelosi also said she's asked Capitol Police to conduct 'security assessment' of Omar

White House press secretary Sarah Sanders said President Trump wishes 'no ill will' against Rep. Ilhan Omar

White House press secretary Sarah Sanders said Sunday that President Trump wishes Representative Omar 'no ill will' — as she insisted he was right to put the congresswoman on blast.

'Certainly the president is wishing no ill will, and certainly not violence towards anyone, but the president is absolutely and should be calling out the congresswoman for her not only one time but history of anti-Semitic comments,' Sanders said on ABC News' 'This Week' in Sunday morning interview.

She said Omar's description of the 9/11 terror attacks as 'people who did something' was 'absolutely abhorrent' and Democrats should also confront her.

'I find what her comments to be absolutely disgraceful and unbefitting of a Member of Congress,' Sanders said,' and I think that it's a good thing that the president is calling her out for those comments, and the big question is why aren't Democrats doing it as well,' Sanders said.

Democrats rushed to defend the freshman lawmaker, who made history last year when Minnesotans elected her to Congress. She is one of two Muslim women serving in the legislative body.

Omar herself hit back at the president Saturday in a series of explosive tweets, insisting she remains undeterred by Trump's criticism and will continue to 'fight and defend' democracy against his administration's policies.

She stirred controversy again last week after remarks she made last month about Muslims in the context of the 9/11 terror attacks resurfaced.

In Saturday tweets she said she 'didn't run for Congress to be silent' and the nation's 'core beliefs are under threat' from the current administration.

'I did not run for Congress to be silent. I did not run for Congress to sit on the sidelines,' she added. 'I ran because I believed it was time to restore moral clarity and courage to Congress.'

Omar also addressed insults involving her patriotisn, saying, 'No one person – no matter how corrupt, inept, or vicious – can threaten my unwavering love for America. I stand undeterred to continue fighting for equal opportunity in our pursuit of happiness for all Americans.'

Omar has on several occasions been accused of Antisemitism. She says the furor surrounding her 9/11 comments stems from the fact that she's Muslim

Trump tweeted 'WE WILL NEVER FORGET' with a video that showed Omar's 'some people did something' 9/11 speech intersected with video of the disaster

His video stressed the remark she says is being taken out of context about the 9/11 hijackers

He came under scrutiny for using painful images of the Twin Towers burning to go after her

Omar concluded the thread by thanking those that continued to stick by her in her fight to establish an 'America we all deserve,' in nod to Ocasio-Cortez's effort on Friday evening to get Democratic lawmakers to back up their colleague.

Ocasio-Cortez branded the tweet a 'dangerous' declaration of prejudice that could incite harm against the politician who's facing a slew of death threats and abuse.

'Members of Congress have a duty to respond to the President's explicit attack today,' Ocasio-Cortez tweeted on Friday evening. '[Ilhan Omar's] life is in danger. For our colleagues to be silent is to be complicit in the outright, dangerous targeting of a member of Congress. We must speak out.'

The New Yorker shared an image of Martin Niemöller's famous poem 'First they came…' that was inspired by the Holocaust and hangs on the wall of the Washington, D.C. museum memorializing the tragedy.

The poem reads: 'First they came for the socialists, and I did not speak out— because I was not a socialist. Then they came for the trade unionists, and I did not speak out— because I was not a trade unionist. Then they came for the Jews, and I did not speak out— because I was not a Jew. Then they came for me—and there was no one left to speak for me.'

On Saturday, Omar took to Twitter with an explosive thread of tweets in response President's attack, insisting she 'didn't run for congress to be silent'

AOC tweeted in defense of Omar using Martin Niemöller's famous poem 'First they came…' to condemn a tweet of the President's on Friday night

Despite the poem's sharing of similar themes to her tweet, Ocasio-Cortez sparked outrage online among critics who believed her use of Niemöller's famed piece was 'disturbing' in the context that it was used.

The outcry stemmed from a number of comments that Omar has made over the past few months about Israel.

Omar's speech to CAIR was about the necessity for the organization in today's political environment.

She said, 'Far too long we have lived with the discomfort of being a second-class citizen and frankly, I'm tired of it and every single Muslim in this country should be tired of it.

'CAIR was founded after 9/11 because they recognized that some people did something, and that all of us were starting to lose access to our civil liberties.'

Since the controversial comments went viral on Twitter, Omar has defended herself by invoking George W. Bush's remarks at Ground Zero. He intentionally refused to refer to the hijackers as Muslims.

'Was Bush downplaying the terrorist attack? What if he was a Muslim,' she asked on Twitter.

Despite the poem sharing similar themes to her tweet, AOC has been widely blasted by critics who believe the Holocaust-origins of 'First They Came...' make the use of it in defense of Omar inappropriate

Democrats for the presidency, including Sens. Bernie Sanders, Elizabeth Warren, Beto O'Rourke, Amy Klobuchar and Pete Buttigieg lined up to support her after Trump seized on the comparison.

They called the president's behavior 'disgusting' and noted that Omar was already receiving death threats.

Sanders said Saturday at an event: 'Remember, George W. Bush, I didn't have a lot in common with him.

'What did he do a few days after 9/11, he went into a mosque. You remember that? He went into a mosque to say that criminals, terrorists, attacked the United States, not the Muslim community. That's what he did. It's true. We have had a president who for cheap political gain is trying to divide us up, by the color of our skin ... by our religion.

'By God, that is not what a president should - we can disagree, for God's sakes, that's democracy, but you don't have the President of the United States trying to get us to hate undocumented people. You know, that's not what America's supposed to be about.'

The Washington Post first noted that Bush once referred to the terrorists as 'the people who knocked these buildings down' in remarks at Ground Zero a few days after the attack.

Omar piggybacked on the example in a tweet that linked to the original article.

She had said at a fundraiser for CAIR that the organization 'was founded after 9/11 because they recognized that some people did something and that all of us were starting to lose access to our civil liberties.

'So you can't just say that today someone is looking at me strange and that I am trying to make myself look pleasant. You have to say that this person is looking at me strange, I am not comfortable with it, and I am going to talk to them and ask them why. Because that is the right you have,' she stated.

The remarks earned her new criticism, having already weathered allegations that she's an anti-Semite.

'First Member of Congress to ever describe terrorists who killed thousands of Americans on 9/11 as 'some people who did something,' GOP Rep. Dan Crenshaw said in an accusatory tweet. 'Unbelievable.'

Fox & Friends' Brian Kilmeade said on the morning program he co-hosts, 'You have to wonder if she's an American first.'

The New York Post on Thursday even went as far as to splash a photograph one of the World Trade Center towers collapsing in a ball of flames, with the banner: 'Rep. Ilhan Omar: 9/11 was 'some people did something.'

The Washington Post's fact checker first pointed out that Bush once said something similar in a Sept. 14, 2001 speech, when he spoke through a bullhorn at Ground Zero.

Bush told rescue workers in an impromptu speech through a bullhorn that the nation mourns victims of the Twin Towers attack.

'I can't hear you!' one told him. Bush said, 'I can hear you! I can hear you! The rest of the world hears you! And the people -- and the people who knocked these buildings down will hear all of us soon!'

Rep. Ilhan Omar compared her controversial 9/11 comment to one George W. Bush made after the attack, suggesting Friday that he would have faced similar backlash if he were Muslim

It was part of an intentional effort by Bush not to refer to the attackers as Muslims.

Three days after the impromptu speech delivered by bullhorn, Bush visited the Islamic Center of Washington D.C. to condemn attacks on Muslims.

He said: 'The face of terror is not the true faith of Islam. Islam is peace. These terrorists don't represent peace. They represent evil and war.

'Those who feel like they can intimidate our fellow citizens to take out their anger don't represent the best of America, they represent the worst of humankind, and they should be ashamed of that kind of behavior.'

Omar connected the dots on Friday and pointed out in a tweet that Bush did not come under assault for having referred to the attackers as 'people' instead of murderers or terrorists.

Bernie Sanders was the first major Democrat to follow in AOC's footsteps on Friday night

Elizabeth Warren was next, tweeting after Sanders that she too found Trump's attack 'disgusting'

Minnesota's Amy Klobuchar joined her Senate colleagues in supporting Omar hours later. She was careful to note that she does not condone the congresswoman's remarks but found Trump's tweet to be offensive

The New York Post even went as far as to splash a photograph one of the World Trade Center towers collapsing in a ball of flames, with the banner: 'Rep. Ilhan Omar: 9/11 was 'some people did something''

Other candidates including Beto O'Rourke, Pete Buttigieg and Julián Castro also condemned Trump's attack on Omar

The issue of whether to link al Qaeda and other terrorist attacks including 9/11 to Islam became a campaign issue in 2016 when Trump accused former Barack Obama of refusing to call out 'radical Islamic terrorism.'

He then leveled the same charge at Hillary Clinton, accusing her of being in 'total denial' for not calling the Pulse nightclub shooting in Orlando, Florida, the work of a radical Islamic terrorist.

She had tweeted: 'Islam is not our adversary. Muslims are peaceful and tolerant people, and have nothing whatsoever to do with terrorism.'

Trump said, 'She is in total denial. And her continuing reluctance to ever name the enemy broadcasts weakness across the world.'

However, when he made his first foreign trip as president to Saudi Arabia, the home country of a majority of the 9/11 attackers and its mastermind Osama bin Laden, he struck a different note.

'This is not a battle between different faiths, different sects, or different civilizations,' Trump said. 'This is a battle between barbaric criminals who seek to obliterate human life, and decent people of all religions who seek to protect it.'