Republicans in the United States Senate have voted down legislation that would have required US President Donald Trump to obtain congressional approval for any military attacks on Venezuela.

Two Republicans had crossed the political aisle and joined Democrats to vote in favour of the legislation on Thursday, but their support was not enough to secure passage, and the bill failed to pass by 51 to 49 votes.

“We should not be going to war without a vote of Congress,” Democratic Senator Tim Kaine said during a speech.

The vote comes amid a US military build-up off South America and a series of military strikes targeting vessels in international waters off Venezuela and Colombia that have killed at least 65 people.

The US has alleged, without presenting evidence, that the boats it bombe

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