LONDON (Reuters) - British Prime Minister Boris Johnson on Tuesday lost his parliamentary majority in a heated political showdown with "conservative" lawmakers from his conservative party who will try to block Brexit without an agreement, leading to early elections within weeks.

Government officials have waved to call early general elections in the middle of next month, though Johnson has said he does not want them.

Johnson denounced MPs' efforts to block his Brexit strategy, saying it would undermine his intention to negotiate a new withdrawal agreement with the EU.

He said the move by opposition lawmakers and members of his conservative party to seek to postpone the Brexit until October 31 if he did not agree with the conditions for going out with Brussels would be a "white flag".

Ahead of a first vote in the House of Commons on Tuesday evening, Johnson said, "I would not agree to such a thing under any circumstances."

His aides had warned that the defeat could prompt him to call early elections ahead of a crucial EU summit on October 17-18, just two weeks before the Brexit.

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According to British media, Johnson will resort to the option of early elections if the House of Commons succeeds in controlling the agenda of parliament today, and vote in favor of a bill that prevents his government from leaving the European Union without an agreement.

The Nuba will first seek to put the text of the bill on the parliament's agenda for discussion.

Early elections would present three key options: a government that would support the exit from the bloc led by Johnson, a Labor-led government led by Corbin, or a suspended parliament that could lead to a coalition or minority government.

Under the British election law, the next election is to be held in 2022 and the support of two-thirds of the deputies is required to hold the elections ahead of time.

Labor, the largest opposition party, has already announced that it would welcome a general election, but some in the party are worried about holding elections before passing legislation that would force the next prime minister, whatever, to delay Brexit if no agreement is reached with Brussels before October 31. .

Conservative lawmakers are also unlikely to favor elections because they expect them not to be chosen as candidates, as punishment for their rebellion.

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The British prime minister has suspended the work of parliament for five weeks, and said he would not delay the date of Brexit under any circumstances, in a move that sparked protests in the British street.

Johnson took office less than six weeks ago, after his predecessor Theresa May was forced to resign for failing to pass the Brexit deal in parliament.

From the outset, Johnson faced opposition from his party lawmakers worried that his threat to leave the EU without an agreement with Brussels risked economic damage.