Donald Trump's running mate Mike Pence is breaking with the Republican nominee by endorsing House Speaker Paul Ryan in his primary fight.
Mr Pence said in a phone interview with Fox News Channel that he is pleased to endorse Mr Ryan.
The move comes a day after Mr Trump said in an interview that he is "just not quite there yet" when it comes to backing Mr Ryan, who has at times been critical of Mr Trump's most controversial comments.
Mr Pence says that he spoke with Mr Trump on Wednesday morning about his "support for Paul Ryan and our long-time friendship".
He said that Mr Trump "strongly encouraged me to endorse Paul Ryan in next Tuesday's primary. And I'm pleased to do it."