Sen. John McCain, R-Ariz., criticized President Trump on Saturday for not more forcefully speaking on human rights while at the Asia-Pacific Economic Cooperation forum in Danang, Vietnam.

"@POTUS in #Danang no mention of human rights - Sad," McCain wrote on Twitter.

Critics have accused Trump of avoiding the issue because he has not spoken about it in his official public speeches while abroad in Asia.

Speaking with reporters, however, Trump said he has expressed concern about human rights in conversations with world leaders.

"Well, I do do it. But I also raise issues on many other things," he said, adding that the U.S. is dealing with Russia on the humanitarian crisis in Syria.

"But when we can save many, many, many lives by making a deal with Russia having to do with Syria, and then ultimately getting Syria solved, and getting Ukraine solved, and doing other things, having a good relationship with Russia is a great, great thing," he said.