Sen. John McCainJohn McCainA guide to the committees: Senate Webb: The future of conservatism New national security adviser pick marks big change on Russia MORE (R-Ariz.) offered his colleague Sen. Ted CruzTed CruzA guide to the committees: Senate Trump wants to cut red tape? He should start with the CFPB. Why President Trump should choose Maureen Ohlhausen to lead the FTC MORE a non-endorsement on the eve of the Texas Republican's expected presidential launch.
And if Cruz ultimately wins the nomination, he could beat Hillary Clinton and go all the way in 2016, McCain suggested.
But McCain pointed out his deepest support remains with his friend and potential 2016 Republican presidential contender, Sen. Lindsey Graham (R-S.C.).
"Lindsey Graham is the one I think knows best about national security," McCain said.
Cruz is expected to announce his White House bid Monday during a speech at the evangelical Liberty University.