Former President Donald Trump continues to gain support and momentum as he managed another primary victory on Saturday against Nikki Haley in her home state of South Carolina.

Following the win, Trump managed to pick up another major endorsement: The Senate’s No. 2 Republican, John Thune of South Dakota, who is seen as Minority Leader Mitch McConnell’s deputy.

“The primary results in South Carolina make clear that Donald Trump will be the Republican nominee for president in this year’s pivotal presidential election. The choice before the American people is crystal clear: It’s Donald Trump or Joe Biden,” Thune told Fox News Digital.

“I support former President Trump’s campaign to win the presidency, and I intend to do everything I can to see that he has a Republican majority in the Senate working with him to restore American strength at home and abroad,” he continued.

“Together we must put an end to the disastrous Biden-Schumer agenda. Our country cannot endure another four years of Bidenomics, continued lawlessness at our southern border, and American weakness on the global stage.”

Thune said he and the former president spoke on the phone Saturday night after Trump’s major South Carolina win, Fox News Digital noted further.

The outlet noted that prior to pledging his support to Trump, it remained uncertain whether Thune, who is considered a potential successor to McConnell as the leader of the GOP Senate conference, would endorse either Trump or Haley. Initially, Thune had endorsed Senate colleague Tim Scott (R-S.C.) before Scott withdrew from the race last autumn.

As for McConnell, he and Trump have a rocky relationship that has remained frosty following Trump’s term in office. Earlier this month, he would not say whether that relationship would prevent him from endorsing Trump again.

“I’ve stayed essentially out of it, and when I change my mind about that, I’ll let you know,” he told reporters when he was asked about it during a press conference.