President Donald Trump lashed out at his own Justice Department Monday for seeking the Supreme Court's backing for a "watered down, politically correct version" of the travel ban he signed in March instead of a broader directive that was also blocked by the courts.

In a series of early morning tweets, Trump urged the Justice Department to ask for an "expedited hearing" at the high court and seek a "much tougher version" of the order temporarily blocking entry to the U.S. from a half-dozen majority Muslim countries. He called the courts, which have blocked both versions of the travel ban, "slow and political."

It's unclear whether the president has conveyed his requests to the Justice Department, which he oversees, in a forum other than Twitter. The White House did not immediately respond to requests for that information.

The president has renewed his push for the travel ban in the wake of the vehicle and knife attack in London that left seven people dead and dozens injured. The Islamic State has claimed responsibility for the attack.

Trump also stressed that his proposal was a "travel ban," a description his aides have disputed in the past. He said on Twitter that others "can call it whatever they want, but I am calling it what we need and what it is, a TRAVEL BAN!"

The president spent much of the weekend responding to the attack on Twitter. In one instance, he leveled an inaccurate criticism of London Mayor Sadiq Khan, saying the mayor was telling people there was "no reason to be alarmed" about the attack. The mayor had instead been telling London residents not to be concerned by a stepped-up police presence in the city following the attack.

"No reason to be alarmed," Khan said, describing a more visible presence as "one of things the police and all of us need to do to make sure we are as safe as we possibly can be."

Later, the mayor's spokesman said he was too busy to respond to Trump's "ill-informed" tweet.

Trump also addressed the London attack Sunday night at the conclusion of a fundraiser for Ford's Theater, scene of one of the most famous acts of bloodshed in American history: the assassination of President Abraham Lincoln.

"America sends our thoughts and prayers and our deepest sympathies to the victims of this evil slaughter and we renew our resolve, stronger than ever before, to protect the United States and its allies from a vile enemy that has waged war on innocent life, and it's gone on too long," Trump said.