President Trump suggested in a tweet on Sunday that the timing of his former attorney Michael Cohen’s testimony before the House Oversight Committee “may have contributed” to failed denuclearization talks between the U.S. and North Korea.

For the Democrats to interview in open hearings a convicted liar & fraudster, at the same time as the very important Nuclear Summit with North Korea, is perhaps a new low in American politics and may have contributed to the “walk.” Never done when a president is overseas. Shame! — Donald J. Trump (@realDonaldTrump) March 4, 2019

White House officials have previously complained about the timing of Cohen’s testimony, during which the President’s former fixer claimed that Trump had previous knowledge of hush payments and the 2016 Trump Tower meeting with a Russian lawyer, among other things.

After talks between Trump and Kim Jong-un failed last week, the White House said Trump had to “walk” away from from negotiations because Kim wouldn’t budge on his request for the U.S. to drop all sanctions against North Korea.