The Trump administration is preparing to brief all 100 senators this week on the situation in North Korea, as President Donald Trump calls the country a “real threat to the world” and confers with the leaders of China, Japan and Germany.

The unusual full-Senate briefing is scheduled for Wednesday, according to reports, and comes after Trump criticized North Korea’s “continued belligerence” in a phone call with President Xi Jinping of China on Sunday. In a separate call with German Chancellor Angela Merkel on Monday, Trump discussed “the urgent security challenge posed by North Korea,” the White House said.