Paul Ryan Still Not Ready to Endorse Donald Trump

It's unclear when an endorsement will be announced.

— -- House Speaker Paul Ryan declined to endorse presumptive Republican presidential nominee Donald Trump on Wednesday after senior-level Trump campaign sources told ABC News earlier today that Ryan was preparing to do so.

Speaking to reporters, Ryan said he has not made a decision about whether to endorse Trump.

"I have no timeline in mind," Ryan said at a briefing for the press in his Capitol Hill office.

It has been widely reported that Trump and Ryan haven't seen eye to eye on several issues.

After the meeting, Ryan and Trump issued a joint statement calling for Republicans to "unite around our shared principles, advance a conservative agenda and do all we can to win this fall."

But Ryan still wasn't ready to get behind Trump.

ABC News' John Santucci contributed to this report.