Busses cross Westminster Bridge near the Elizabeth Tower, better known as Big Ben | Daniel Leal-Olivas/AFP via Getty Images UK intelligence committee membership agreed After four-month delay, Theresa May signs off membership of parliamentary committee that scrutinizes UK security services.

LONDON — A four-month delay agreeing the membership of the highly sensitive House of Commons intelligence and security committee has finally been cleared, according to senior officials and MPs familiar with the situation.

The committee can now be set up “imminently,” according to four people who spoke to POLITICO on condition of anonymity.

Unlike other parliamentary committees, MPs and peers who sit on the ISC must be security cleared and signed off by the prime minister because of the sensitive nature of the material they are given access to while holding the secret intelligence services to account.

MPs have been increasingly angry that despite a series of terror and cyberattacks on British soil since the committee last met in April — including the suicide bombing in Manchester on May 22 in which 22 people died — there has been an unprecedented delay re-establishing the committee since the June 8 election.

On Monday, House of Commons Speaker John Bercow told MPs it was "absurd and indefensible" that some committees still had not been set up.

Senior MPs from both main parties attributed the delay to disagreements within the Labour Party over which three MPs it wished to put forward.

Senior parliamentary officials deny any rift between the party's chief whip Nick Brown and leader Jeremy Corbyn — the two figures responsible for putting forward Labour's nomination — but admit there were more Labour MPs who put forward their names to serve on the committee than there were spaces, leading to a lengthy process of whittling down the nominations.

The Labour Party, however, insists the government hasn't put any pressure on them to provide a list of names and has had the party’s nominations for “weeks” without agreeing them. Only three names were put forward, according to two officials, and the MPs are of such caliber they cannot reasonably have caused a delay in terms of getting their security clearance or posed a problem for the prime minister.

According to one politician familiar with the work of the committee, all nominees were "perfectly acceptable.” The MP said the prime minister had now signed off the appointments and there should be an announcement in both houses of parliament in the coming days. A second senior MP familiar with the ongoing saga said it was also his understanding that the final go-ahead had been agreed by No. 10 Downing Street.

A spokesman for the prime minister declined to comment.