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Ted Cruz says he will vote for Donald Trump after heated rivalry

Cruz finally endorses Trump

Sen. Ted Cruz on Friday said he will vote for Donald Trump after not doing so at the Republican National Convention in July.

In a Facebook post, Cruz said he decided to vote for Trump "after many months of careful consideration, of prayer and searching [his] own conscience."

Trump said in a statement that he is "greatly honored by the endorsement of Senator Cruz."

"We have fought the battle and he was a tough and brilliant opponent. I look forward to working with him for many years to come in order to make America great again," Trump said.

The senator from Texas cited two reasons for his decision. First, he wanted to honor his promise to support the Republican nominee. Cruz said the second reason is that although he has had "areas of significant disagreement" with Trump, "by any measure Hillary Clinton is wholly unacceptable."

Republican presidential candidates businessman Donald Trump (L) and Texas Sen. Ted Cruz shake hands before the start of the Republican Presidential Debate in Las Vegas on Dec. 15, 2015.
Robyn Beck | AFP | Getty Images

Cruz spent the majority of his Facebook post criticizing Clinton's policies, including her positions on energy, immigration, national security and internet freedom.

"If Clinton wins, we know — with 100 percent certainty — that she would deliver on her left-wing promises, with devastating results for our country," Cruz said. "My conscience tells me I must do whatever I can to stop that."

He also said the former secretary of state is "manifestly unfit to be president." Cruz also tweeted a link to the post alongside the hashtag #NeverHillary.

Cruz congratulated Trump on winning the nomination at the Republican National Convention, but was booed by the crowd when he concluded his speech without a clear endorsement of the New York businessman.

Trump once retweeted a tweet criticizing the appearance of Cruz's wife, Heidi. Cruz on the other hand called Trump a "a pathological liar" on May 3.

Cruz was one of the few Republican presidential candidates to briefly threaten Trump's rise within the GOP, winning the key Iowa caucus. The Texas senator suspended his campaign in May after a series of losses in the primary race.

This story is developing. Please check back for further updates.

— CNBC's Fred Imbert contributed to this report.