The European Union's trade commissioner Cecilia Malmstrom has no time for anyone who tries to bully Canada's Foreign Affairs Minister Chrystia Freeland — even if it's Donald Trump.

"You have a fantastic chief negotiator in Ms. Freeland. I think she is doing an excellent job under very tough conditions," Malmstrom told Chris Hall in an interview on The House.

Malmstrom reacted strongly to the suggestion that the U.S. administration is attempting to bully Freeland after Trump criticized Canadian NAFTA negotiators in a press conference Wednesday.

"We're very unhappy with the negotiations and the negotiating style of Canada. We don't like their representative very much," he said.

Trump did not mention Freeland by name, but she has been acting as the lead official for Canada during the ongoing NAFTA talks.

Malmstrom said Trump's comments show that "it is increasingly difficult dealing with the Americans." She said she frequently discusses trade issues with Freeland as both Canada and the European Union work on separate deals with the U.S.

Canada is still dealing with new U.S. tariffs, and now there's concern Italy will not ratify the Canada-European Union trade deal. 3:26

"We talk regularly. I don't think I have advice to give her, but we are sharing our experiences because it's more important than ever that the European Union and Canada are sticking together," she said.

Other senior U.S. officials have been voicing frustration with Canada lately as the talks have dragged on. Key Trump ally Rep. Kevin Brady, the Texas Republican who chairs the House ways and means committee, criticized Canada for "dragging its feet" on NAFTA.

"Canada is not an easy trading partner," he told CNBC's Squawk Box earlier this month.

Republican House whip Steve Scalise slammed Canada's hardball negotiating tactics and admitted a "growing frustration with many in Congress" over the delay in arriving at a deal.

Malmstrom said the pattern of behaviour coming the United States is causing other countries to flock to Canada and the European Union for trade partnerships.

"Lately we have seen there are increasing disagreements between many countries around the world and the way is U.S. is turning very unilateral," she said.

"More and more countries are coming out and want to work with the EU and Canada to strengthen the multilateral relationship."