Key Trump ally Senator Lindsey Graham has told supporters he is going back to the Senate "with a purpose" after holding on to his seat in South Carolina.
Graham, who is chairman of the powerful Senate Judiciary committee, appeared to be in the fight of his political life against an opponent who had raised record amounts of campaign funding.
He said: "I've never wanted my job more than I do now. I've never appreciated my job more than I do now. I've never been more grateful to have it, and I've never been more prepared to do it than I am now."
His victory is a boost for Republicans looking to keep their Senate majority.
Outlining his priorities he told supporters: "We are going to put our national security interests ahead of everything else because without national security, nothing else matters."