Washington, Sep 18 (TIWN) Democratic presidential nominee Joe Biden has warned the UK against breaking the Brexit deal, saying he will not allow peace in Northern Ireland to become a "casualty" if he is elected in November, the media reported.

Taking to Twitter on Wednesday, Biden said: "We can't allow the Good Friday Agreement that brought peace to Northern Ireland to become a casualty of Brexit.

"Any trade deal between the US and UK must be contingent upon respect for the Agreement and preventing the return of a hard border. Period."

The Good Friday Agreement refers to a pair of deals signed on April 1998 that ended most of the violence of the Troubles, a political conflict in Northern Ireland that had been ongoing since the 1960s.

It served as a major development in the Northern Ireland peace process of the 1990s.