ORLANDO, Fla. (AP) - The presidential race between Hillary Clinton and Donald Trump overshadowed the debate between Republican U.S. Sen. Marco Rubio and his Democratic challenger, U.S. Rep. Patrick Murphy, in its opening minutes.

Murphy defended the former Secretary of State when asked Monday why Floridians should trust him when they don't trust Clinton, who he is backing.

Murphy says he trusts Clinton with the nation's nuclear code and that she is as qualified as any candidate. He called Trump the most unfit candidate to run for the White House.

Rubio said he doesn't trust either candidate, but he's asking voters to send him back to Washington so he can stand up to the president, whether Trump or Clinton.

Rubio has said he won't appear with Trump but is still backing the GOP nominee.