Sen. John Cornyn’s landslide defeat Tuesday immediately raised a pressing question for his GOP colleagues: Will he join the ranks of other Republicans recently vanquished by President Donald Trump and begin bucking the president more?

President Donald Trump's endorsements loomed large over Tuesday's runoff elections in Texas.

Texas AG Ken Paxton, endorsed by Trump as a "MAGA Warrior," defeats Sen. John Cornyn in the heated Republican Senate primary runoff election.

U.S. Sen. John Cornyn tried for more than a year to show Donald Trump and Texas Republicans that he and the president were on the same team.

The president has endorsed Texas Attorney General Ken Paxton over incumbent Senator John Cornyn in the race.

By Nolan D. McCaskill WASHINGTON, May 26 (Reuters) - Texas Attorney General Ken Paxton ousted four-term U.S. Senator John Cornyn on Tuesday, riding President Donald Trump's endorsement to a runoff victory for the Republican Senate nomination,

The senator fell short in his primary runoff against Ken Paxton, who will now face Democrat James Talarico in November.

President Donald Trump's victory in Texas may have Republicans nervous about the upcoming midterm elections.

Top Republican is on a collision course with Donald Trump. Can John Thune survive the crash? - ANALYSIS: Thursday’s showdown in the Senate was significant, writes John Bowden, but would the majority leader dare being labeled disloyal to King MAGA?