ES News email The latest headlines in your inbox twice a day Monday - Friday plus breaking news updates Enter your email address Continue Please enter an email address Email address is invalid Fill out this field Email address is invalid You already have an account. Please log in Register with your social account or click here to log in I would like to receive lunchtime headlines Monday - Friday plus breaking news alerts, by email Update newsletter preferences

A top London investment bank has told its clients Theresa May will be ousted as Prime Minister in just a matter of months.

American financial services giant Citigroup, which bases its London office in Canary Wharf, sent out a note to its clients urging them to prepare for the PM's fall from the leadership and another general election within a year.

According to the Times, the bank said Mrs May’s current position was “unsustainable” as she faced attack from both hardline Brexit supporters and Remainers.

It comes after Mrs May agreed a deal with Northern Ireland’s Democratic Unionist Party to prop up the Conservative Government after the Tories failed to win a majority in the General Election.

Mrs May promised an extra £1 billion for Northern Ireland in exchange for the DUP’s backing on key Parliament votes which, if lost, could see the Government brought down.

In the note to clients, Citigroup said Mrs May is braced for a “harsh backlash in the anti-EU British media” as the Tories negotiate through Brexit talks and the expected divorce bill.

“In our view, May's premiership is not sustainable beyond a few months, perhaps a year at most, and will be under pressure in the face of contentious parliamentary votes from the very beginning," said the bank’s chief political analyst Tina Fordham in the note.

The note predicted there was “numerous opportunities for Parliamentary rebellion” and that the next Tory leader to replace Mrs May would be likely to call an election.