Dominion Voting Systems, an elections technology company founded in Toronto, is being targeted by U.S. President Donald Trump and his allies as they claim the recent presidential election results were rigged by the firm — claims the company says are entirely baseless.

Trump has sent a series of tweets about Dominion in the days since president-elect Joe Biden secured the 270 electoral votes needed to take the Oval Office.

The outgoing president has called the operation — which also has U.S. offices in Denver, Colorado — a "radical left" company with a "bad reputation" that supplies states with "bum equipment."

He claims the company's products are "not good or secure" and were manipulated by Democrats and other unnamed bad actors to swing the election for Biden.

The firm supplies voting and tabulating equipment to counties in 28 states and Puerto Rico — machines that are used to count the lengthy U.S. ballots. Dominion equipment was in use in four states that proved to be critical to the end result: Arizona, Michigan, Nevada and Georgia.

But this isn't the first time that Dominion's machines have been widely used during a U.S. election. The company, which is the dominant player in the election technology sector, counted 70 million votes in more than 1,600 jurisdictions in the 2016 presidential election that Trump won, according to data compiled by researchers at the University of Pennsylvania. Dominion machines counted ballots in Pennsylvania, Michigan and Wisconsin — states Trump narrowly carried in that contest.

Trump seized on a Tuesday social media post from Elections Canada which said the Dominion voting machines in question are not used for federal elections in this country. He tried to use the Elections Canada statement to bolster his claim that there's something wrong with how the voting company does business.

"Elections Canada does not use Dominion Voting Systems. We use paper ballots counted by hand in front of scrutineers and have never used voting machines or electronic tabulators to count votes in our 100-year history," Elections Canada, an independent federal agency, said on Twitter.