“I haven’t seen anything like this,” the Arizona Republican told reporters, explaining that the Trump administration “should answer questions.”

“The American people should demand it,” McCain continued. “The dimensions of this are huge.”

He said his first reaction upon reading Trump’s tweet on Saturday morning was “intense curiosity.”

“This is unprecedented,” he added. “I have never heard of a president of the United States accusing his predecessor or any other president of the United States of violating the law.”