Since President Donald Trump's decision to fire former FBI director James Comey, betting odds on Trump's impeachment have skyrocketed.

Gamblers are particularly bullish on Trump's impeachment in Europe, where Irish bookmaker Paddy Power told Politico that the odds of Trump not finishing his first term had jumped from 10/11 (52 percent) to 4/6 (60 percent).

"We can attribute this to the news of Comey's sacking. [That] is the shortest we've been for Trump to be impeached in his first term," a Paddy Power spokesman told The Independent.

"Paddy Power customers have been lumping on Trump to come undone, with thousands staked on him not completing his first term in office and to be impeached," said Paddy Power spokesman Lewis Davey to Politico.

"That's despite GOP control of both congressional chambers—and the fact that few Democrats are openly talking about impeaching Trump, even after the Comey firing," Politico observes.

U.K. bookmakers reported a similar rush to bet on Trump's impeachment since the Comey announcement. The Independent writes:

Betfair said its peer-to-peer Exchange platform saw "a rush of activity in the 24 hours after the announcement." A huge £100,000 bet on Mr Trump to leave before the end of his first term helped shift odds from 15/8 to 11/10, it said.

And some 2,000 punters backed 2017 as the year he would leave office. A spokeswoman said: "The odds for 2017 plummeted from 9/1 to 3/1 immediately after the announcement. They've since resettled at 5/1 now. 2020 or later is still the favorite but the odds have drifted from a clear odds-on chance to just even money since the FBI sacking."

Gamblers in the U.K. have been eager to bet on Trump's impeachment since his inauguration. In February, U.K. bookmaker Ladbrokes reported that the odds of Trump failing to finish his first term had shortened to 10/11 (90 percent).

"The money is showing no signs of slowing down and we've been forced to cut Trump's impeachment odds accordingly," said Jessica Bridge of Ladbrokes at the time. "We've taken five times the amount of bets on him failing to see out his full term than on him doing so."

"Ladbrokes didn't even offer odds on Obama being impeached or resigning, which speaks volumes about the current president," Bridge added.

"Donald Trump to be ousted from the White House before he finishes his first term has been a popular bet since he came into power, however following his recent actions there's been a surge of activity for this to happen before the end of the year," a spokesman for the betting comparison site Oddschecker told the Independent.

"In the months following his inauguration, 58 percent of bets placed were on Trump leaving office in 2020 or later. However, since Tuesday's shock sacking, 60 percent of bets have been on him leaving in 2017 at 2/1, a price which has shortened from 9/2 in the same time-period," the spokesman added.

Meanwhile, Americans are also placing their bets on Trump's impeachment, with U.S. betting site PredictIt placing Trump's chances of being in office by the end of 2017 at just 80 percent as of Thursday, down from 87 percent three days prior.