President-elect Donald Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE has selected Sen. Jeff Sessions Jefferson (Jeff) Beauregard SessionsGOP set to release controversial Biden report Trump's policies on refugees are as simple as ABCs Ocasio-Cortez, Velázquez call for convention to decide Puerto Rico status MORE (R-Ala.) to serve as his attorney general, Trump's transition team announced Friday morning.

Sessions becomes the first person selected by Trump to a Cabinet-level position in the new administration. In doing so, Trump selected one of his most loyal supporters and a senator whose border-security positions predated Trump's candidacy.

“Jeff has been a highly respected member of the U.S. Senate for 20 years,” Trump said in a statement. “He is a world-class legal mind and considered a truly great Attorney General and U.S. Attorney in the state of Alabama. Jeff is greatly admired by legal scholars and virtually everyone who knows him.”

The 69-year-old Alabama Republican was the first senator to endorse Trump's White House bid. Two of his top staffers have become key players in Trump's orbit on the campaign and the transition team.

That loyalty has gone a long way with Trump: A source told The Hill ahead of the announcement that Sessions had his pick of Cabinet spots.

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The two men met at Trump Tower on Wednesday, with Trump specifically highlighting the senator's "phenomenal record."

In the statement from Trump’s transition team, Sessions said he is “humbled” to have been chosen for the job.

“My previous 15 years working in the Department of Justice were extraordinarily fulfilling. I love the Department, its people and its mission. I can think of no greater honor than to lead them,” he said.

If confirmed, Sessions would succeed Attorney General Loretta Lynch, the first African-American woman to serve as the nation's top law enforcement official.

But Democratic opposition to Sessions is already beginning, signaling the potential for a rocky path to confirmation.

Past controversies touching on race will dominate the discussion surrounding Sessions, who would preside over an agency with responsibilities to protect civil rights.

Thirty years ago, Sessions was denied a federal judge position over allegations that he had called the NAACP and American Civil Liberties Union "un-American" and said he thought the Ku Klux Klan was "OK, until he learned they smoked marijuana."

Sessions has vehemently denied the claims, but Democrats are already pointing to the accusations as disqualifying.

David Axelrod, President Obama's former senior adviser, blasted Sessions’s selection on Twitter, arguing the appointment will "send chills to advocates of civil and immigrant rights."

The leader of the liberal Democracy for America issued a statement that said Sessions was barely more qualified to lead the Justice Department than a member of the KKK.

“The handful of people who might be even less equipped than Jeff Sessions to dispense justice on behalf of the American people typically spend their weekends wearing pointy hats and burning crosses,” Democracy for American executive director Charles Chamberlain said.

Sessions was a vocal critic of Obama's immigration reform efforts.

Defenders of Sessions argue he has a better record on civil rights than he receives credit for.

Supporters point to his vote in favor of a 30-year extension of the Civil Rights Act, for example, or multiple desegregation lawsuits he filed as a U.S. attorney in Alabama.

Sessions in April 1999, meanwhile, led efforts to award the Congressional Gold Medal to Rosa Parks, a civil rights icon and Alabama native.

Senior Trump adviser Jason Miller told reporters that Sessions is "very well qualified" for the position on a Friday conference call.

He brushed aside concerns about Sessions’s earlier scuttled confirmation, noting that the senator filed a number of desegregation lawsuits while working in the Justice Department, voted for the Civil Rights Act's extension and backed Eric Holder Eric Himpton HolderThe Hill's Campaign Report: Trump's rally risk | Biden ramps up legal team | Biden hits Trump over climate policy Biden campaign forming 'special litigation' team ahead of possible voting battle Pompeo, Engel poised for battle in contempt proceedings MORE, the first black attorney general.

"We feel very confident that Sen. Sessions has the background and the support to receive confirmation," Miller added.

Sessions’s pick has so far been greeted warmly by Republican senators, who will have to sign off on the nomination. The Alabama senator will have to pass through the Judiciary Committee, a feat he could not accomplish during his 1986 appointment, and then get confirmed by the Senate by winning a simple majority of senators.

There are currently 51 Republicans in the Senate and 48 Democrats, with Republicans expected to pick up another seat after a December runoff in Louisiana. Sessions is generally well-liked by his colleagues, and it's likely they will confirm him — especially because of the 51-vote threshold.

Sen. Jeff Flake Jeffrey (Jeff) Lane FlakeJeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Republican former Michigan governor says he's voting for Biden Maybe they just don't like cowboys: The president is successful, some just don't like his style MORE (R-Ariz.), one of Trump's more vocal GOP opponents throughout the election, said he would back Sessions.

And other top Republican senators have signaled through statements they'll vote for him, too, including Majority Whip John Cornyn John CornynThe Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting Liberal super PAC launches ads targeting vulnerable GOP senators over SCOTUS fight Senate GOP faces pivotal moment on pick for Supreme Court MORE (Texas) and Judiciary Committee Chairman Chuck Grassley Charles (Chuck) Ernest GrassleyCollins says she will vote 'no' on Supreme Court nominee before election The Hill's Morning Report - Sponsored by Facebook - Trump, GOP allies prepare for SCOTUS nomination this week Gardner signals support for taking up Supreme Court nominee this year MORE (Iowa).

Sessions has represented Alabama in the Senate for nearly 20 years, and his appointment would leave a vacancy in the ruby-red state.

Sen. Ted Cruz Rafael (Ted) Edward CruzTrump argues full Supreme Court needed to settle potential election disputes Press: Notorious RBG vs Notorious GOP The Hill's Morning Report - Sponsored by Facebook - Washington on edge amid SCOTUS vacancy MORE (Texas), Trump's main rival in the Republican presidential primary, had been interested in the role, too. Cruz met with Trump on Tuesday, and while the senator has publicly demurred when asked about his interest in the position, he privately told those close to him that he was interested in serving as Trump's attorney general.

Cruz quickly released a statement lauding Sessions's nomination as "great news for all of us who revere the Constitution and the rule of law" soon after the selection broke.

Trump on Friday also announced retired Lt. Gen. Michael Flynn as his national security adviser and Rep. Mike Pompeo (R-Kan.) to lead the CIA.

Jonathan Swan contributed. Updated at 2 p.m.