Theresa May set to face no confidence vote, as Tory MPs reach 48 letters
The DUP could also withdraw its support of May does not step down
British PM Theresa May vows to uphold referendum vote on Brexit
Tory MPs have signed a letter calling for a no-confidence vote
Tories sign letter of no confidence against May over Brexit deal
They need 48 to force a vote on the leadership of the party