CLEVELAND — Alabama Sen. Jeff SessionsJefferson (Jeff) Beauregard SessionsNikki Haley blasts Roy Moore's Senate bid: 'He does not represent our Republican Party' Time magazine: Trump threatened reporter with prison time Nadler apologized after repeatedly calling Hope Hicks 'Ms. Lewandowski' at hearing MORE officially nominated Donald TrumpDonald John TrumpFormer Joint Chiefs chairman: 'The last thing in the world we need right now is a war with Iran' Pence: 'We're not convinced' downing of drone was 'authorized at the highest levels' Trump: Bolton would take on the whole world at one time MORE for president to huge rounds of applause at the Republican National Convention in Cleveland on Tuesday.

Sessions, who is Trump’s top ally on Capitol Hill, lauded the billionaire as a disrupter who has tapped into the unease felt by Americans across the country.

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“The American voters heard this message and they rewarded his courage and leadership with a huge victory in our primaries,” Sessions said. “He dispensed with one talented candidate after another, momentum started and a movement started. Democrats and Independents responded. He received far more primary votes than any Republican candidate in history.”

“Mr. Speaker, it is my distinct honor and great pleasure to nominate Donald J. Trump for the office of president of the United States," he added. 

The Quicken Loans Arena exploded into cheers and chants of “Trump." 

Rep. Chris Collins (N.Y.), another top Trump supporter on Capitol Hill, seconded Trump’s nomination.

The Republican National Committee and Trump campaign are hoping for a smooth evening at the convention as they seek to finish off the “Never Trump” contingent once and for all.

Speaker Paul RyanPaul Davis RyanDemocrats talk up tax credits to counter Trump law Trump says Democrats are handing out subpoenas 'like they're cookies' The unexpected shadow of 1994, 25 years later MORE (Wis.) opened the night by instructing the delegates that they must adhere to the rules, in an effort to keep the convention in order.

Meanwhile, delegates from Virginia left the floor to strategize but insisted they would return. Delegates from Washington, D.C., could also be seen huddling together. 

Republicans are expected to officially nominate Trump on Tuesday. He’ll officially accept the nomination in a speech on Thursday night.