Russian President Vladimir Putin will not be invited to address the U.S. Congress if he accepts President Donald Trump's invitation to visit Washington, a senior Republican lawmaker said on Tuesday, calling that a privilege reserved for allies.

The comments by House of Representatives Speaker Paul Ryan reflect the continuing unease among U.S. lawmakers even within Trump's own party about the president's outreach to Putin in the wake of the July 16 summit between the two leaders in Helsinki.

Ryan told a briefing he did not have a problem with Trump sitting down with foreign leaders like Putin, but said the message being conveyed during such talks is what is important.