LONDON, Oct. 19 (Xinhua) -- British lawmakers on Saturday voted for a key amendment to force British Prime Minister Boris Johnson to seek another Brexit extension from the European Union (EU).

By 322 to 306, MPs supported an amendment put forward by former Conservative MP Oliver Letwin that will withhold parliamentary approval for Johnson's deal until parliament passes the EU withdrawal bill legislation.

The decision does not mean that Johnson's deal has failed, but it will make it difficult for him to stick to his deadline of ending Britain's membership of the EU on Oct. 31.

It is likely to mean Johnson asking Brussels to delay Brexit until next January.

However, Johnson said after the vote that he will put bill on deal to leave EU to the parliament next week, trying to avoid delay.