CLEVELAND — Despite being booed from the stage Wednesday, Sen. Ted Cruz is fundraising off his speech at the GOP convention, asking for donations to continue his political fight.

Mr. Cruz punctured the effort at unanimity by refusing to endorse Donald Trump.

In the dramatic final moments of his speech, the crowd in Cleveland chanted for him to live up to the pledge he took to back the eventual nominee. But Mr. Cruz looked at the crowd, acknowledged their passion and walked out anyway without the endorsement.

Hours later, in his fundraising email, he said speaking was “an honor” and said “our cause goes forward.”

“This fight has never been about a particular candidate or campaign, but because each of us wants to be able to tell our kids and grandkids, that we did our best for their future, and for our country,” Mr. Cruz said. He still has two years left in his first term in the Senate, and he said he would be a leader in the chamber. But many analysts say his speech this week more as an early declaration for president in 2020.

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