President Donald Trump on Saturday tweeted his pledge to fight "fake news" after Polish President Andrzej Duda slammed reports that his wife only shook hands with First Lady Melania Trump when they met on Thursday.

Here's the president's post:

Duda ripped as "fake news" reports that his wife, Agata Kornhauser-Duda, appeared to snub Trump to shake hands with Melania Trump when they met after the U.S. president spoke in Warsaw.

Contrary to some surprising reports my wife did shake hands with Mrs. and Mr. Trump @POTUS after a great visit. Let's FIGHT FAKE NEWS. — Andrzej Duda (@AndrzejDuda) July 6, 2017

Trump had extended his hand to Kornhauser-Duda – and video of the president's awkward moment went viral.

However, Kornhauser-Duda did shake President Trump's hand after greeting his wife, based on extended footage of the exchange.

Trump returned to the United States Saturday after visiting Poland and attending the G-20 Summit in Hamburg, Germany.

The president tweeted praise all around for the meeting and its host, German Chancellor Angela Merkel:

The #G20Summit was a wonderful success and carried out beautifully by Chancellor Angela Merkel. Thank you! — Donald J. Trump (@realDonaldTrump) July 8, 2017

Law enforcement & military did a spectacular job in Hamburg. Everybody felt totally safe despite the anarchists. @PolizeiHamburg #G20Summit — Donald J. Trump (@realDonaldTrump) July 8, 2017