NEWS BRIEF President Obama doesn’t believe Donald Trump is fit to be president of the United States. And he’s calling on Republican congressional leaders to say so, too.

In a press conference Tuesday with Singaporean Prime Minister Lee Hsien Loong, Obama cited Trump’s recent criticisms of the Khan family and his lack of “basic knowledge” of foreign policy as evidence “that he’s woefully unprepared to do this job.”

“This is not just my opinion,” Obama said, referring to “denunciations” from prominent Republicans such as House Speaker Paul Ryan and Senator Majority Leader Mitch McConnell. “The question I think that they have to ask themselves is, ‘If you are repeatedly having to say, in very strong terms, that what he has said is unacceptable, why are you still endorsing him? What does this say about your party that this is your standard-bearer?’”

The prime minister’s state visit, in part a celebration of the 50th anniversary of diplomatic relations between the United States and Singapore, is largely focused on the Trans-Pacific Partnership, a 12-country trade deal that’s awaiting a vote in the U.S. Congress. But as is typical with Obama’s press conferences, Trump’s latest controversy came up, when a CBS reporter asked the president about the Khans. The Muslim father and mother who recently spoke at the Democratic National Convention lost their son, Army Captain Humayun Khan, in combat in 2004. In recent days, they have spoken out about Trump’s anti-Muslim policies and remarks. Trump has attacked them in response.