Donald Trump is expected to endorse House Speaker Paul Ryan R-Wis., Friday, two highly placed Republican sources tell Fox News -- just days after the Republican presidential nominee declined to back Ryan when asked in an interview.

Ryan will face primary challenger Paul Nehlen in next Tuesday’s primary election for his congressional seat. Trump is expected to endorse the 2012 Republican vice presidential nominee at an event in Green Bay.

While Ryan picked up the endorsement of Trump’s running mate, Indiana Gov. Mike Pence, Trump declined to endorse Ryan when asked in an interview Tuesday with The Washington Post.

“I like Paul. I like Paul. But these are horrible times for our country. We need very strong leadership. We need very, very strong leadership. And I’m just not quite there. I’m not quite there yet,” Trump said.

Trump’s use of the phrase “not quite there yet,” echoed Ryan’s own hesitancy to back Trump. When asked if he would endorse the billionaire in May, Ryan told CNN: "I'm just not ready to do that at this point. I'm not there right now.”

Trump seemed to soften his stance on Ryan Thursday, calling him "a good guy."

Fox News’ John Roberts contributed to this report