Speaking on The Laura Ingraham Show on Monday, Lt. Gov. Dan Patrick warned U.S. Sen. Ted Cruz will be left "in the rearview mirror of the Republican Party" if he doesn't endorse Donald Trump.

Cruz came under fire from Republicans earlier this year when he refused to endorse Trump during a primetime speech at the Republican convention in Cleveland. Patrick had been somewhat quiet about Cruz in the weeks following the convention, when speculation mounted that Cruz's refusal to endorse Trump would earn him a primary challenger in 2018.

But when Ingraham asked about Cruz and other Republicans who won't support Trump on Monday, Patrick said he was "disappointed."

"You know, I stay loyal to my friends, and Ted’s a friend, but obviously I’m disappointed," Patrick said. "I’m hoping there’s still time for him to come forward or I think he and all the other people you named will be left in the rearview mirror of the Republican Party moving forward. So I’m hoping Ted comes forward. I’m visiting with him on that issue, of course.”

A spokeswoman for Ted Cruz declined to comment.