The FBI asked the Justice Department on Saturday to refute President Donald Trump’s assertion that President Barack Obama ordered the wiretapping of Trump’s phones last year, two sources with knowledge of the situation told CNN. The FBI made the request because such wiretapping would be illegal, since the President cannot just order the eavesdropping of a U.S. citizen’s phones, the sources said.

President Donald Trump wants Congress to look into whether the Obama administration tapped his phones leading up to the election. Trump’s claim, which he outlined in a string of tweets , is entirely unproven, and neither he nor the White House have offered any evidence to back it up.

Republican leaders in Maine and Utah are asking President Donald Trump to step into uncharted territory and rescind national monument designations made by his predecessor. The Antiquities Act of 1906 doesn’t give the president power to undo a designation, and no president has ever taken such a step.

Before he left office, Barack Obama told President Donald Trump that North Korea’s growing missile program and march toward developing a nuclear weapon was the most urgent problem he would face, the New York Times reports. The report also said Obama three years ago ordered Pentagon officials to increase cyberattacks against the missile program in an attempt to disrupt test launches early on, a directive that seemingly turned out well for the U.S. as a large number of North Korea’s military rockets later exploded or veered off course.