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Labour leader Jeremy Corbyn called for Prime Minister Theresa May's resignation on Monday over her record on police cuts in England after recent attacks in England left dozens of people dead.

"There has been a cause made by very responsible people who are very worried that she was at the Home Office for all this time and presided over these cuts in police numbers, and she is now saying we have a problem," Corbyn said on Monday.

"Yes, we have a problem. We should never have cut the police numbers," he said, adding that the upcoming election on Thursday is the best "opportunity" to resolve the situation.

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Corbyn referred to May's cuts while she was UK's Home secretary — the department that presides over the country's immigration and security. May dropped 20,000 police officers in the six years she was in office, according to Sky News.

However, May said budgets for counter-terrorism policing budgets have remained consistent. She insisted that Metropolitan police were "well resourced" and has "very powerful counter-terrorism capabilities," Sky News reported. The terror threat level in the UK remain at "severe."

Corbyn and May temporarily suspended their campaign over the weekend after a vehicle and knife attack at the London Bridge and Borough Hall left seven people dead and nearly 50 others injured. It was the second time the candidates suspended campaigning since the Manchester Arena bombing which killed 22 people. May received overwhelming support in April for Thursday's snap general election. 

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May has hit back at Corbyn by insisting her opponent is unfit to helm Britain's Brexit negotiations when they begin in earnest later this month.

"He doesn't believe in Britain," she said in a blistering attack. "He doesn't have a plan. He doesn't have what it takes."

May has faced some criticism for declining to directly debate Corbyn or any of the smaller party leaders.

Corbyn used a rally in Basildon, in southeastern England, to say that May and the Conservatives are putting Britain's economy at risk by taking an unnecessarily hard line toward the EU over Brexit terms, which may lead to a breakdown in talks.

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He said leaving the EU without a replacement trade deal in place would be the worst possible outcome that could lead to a loss of high-paying British jobs.

"That would mean slapping tariffs on the goods we export -- an extra 10 percent on cars -- with the risk that key manufacturers would leave for the European mainland, taking skilled jobs with them," Corbyn said.

The Associated Press contributed to this report.