Jagmeet Singh is fed up with President Donald Trump's behaviour, and he's not being shy about it.

The NDP Leader took to Twitter on Tuesday to share exactly how he felt about the U.S. President's recent controversial comments on the COVID-19 pandemic.

"Donald Trump's behaviour is reckless and dangerous," Singh wrote. "Trust scientists. Covid-19 is a big deal."

Donald Trump's behaviour is reckless and dangerous.

Trust scientists.

Covid-19 is a big deal.

Wear a mask and help save lives.

— Jagmeet Singh (@theJagmeetSingh) October 6, 2020

On Monday, Trump sent out a tweet while leaving Walter Reed Medical Center, where he spent three days receiving medical treatment after he was diagnosed with COVID-19.

Trump's 50-word statement downplaying the severity of COVID-19 sparked controversy across the country.

"Don't be afraid of Covid," Trump wrote. "Don't let it dominate your life. We have developed, under the Trump Administration, some really great drugs & knowledge. I feel better than I did 20 years ago!"

His words were met with mixed reaction, with many outraged Americans condemning what some perceived to be a lack of empathy and compassion.

"Why weren't these great treatments used to save the lives of 200,000+ people that died under your administration?" one person wrote.

I will be leaving the great Walter Reed Medical Center today at 6:30 P.M. Feeling really good! Don’t be afraid of Covid. Don’t let it dominate your life. We have developed, under the Trump Administration, some really great drugs & knowledge. I feel better than I did 20 years ago!

— Donald J. Trump (@realDonaldTrump) October 5, 2020

Trump followed up his Monday tweet with another statement on the following day, this time alleging that COVID-19 is "less lethal" than the seasonal flu.

Facebook subsequently deleted his statement, while Twitter hid the same message behind a warning about "spreading misleading and potentially harmful information."

Flu season is coming up! Many people every year, sometimes over 100,000, and despite the Vaccine, die from the Flu. Are we going to close down our Country? No, we have learned to live with it, just like we are learning to live with Covid, in most populations far less lethal!!!

— Donald J. Trump (@realDonaldTrump) October 6, 2020

Singh is the first major Canadian politician to condemn Trump for his recent words on COVID-19.

When asked outright about Trump's downplaying of the virus at a press conference on Tuesday, Chief Public Health Officer Dr. Theresa Tam sidestepped the question.

"I think we have learned a lot more about this virus over the last months," Tam said, adding that we're facing a "complex and tricky" few months ahead.

"We should not fear the virus, but do have to adjust our lives in order to manage our way through it," she said.