CONSERVATIVE MP Dominic Grieve has said Theresa May’s handling of Brexit has driven him to the point of tears.

In an astonishing Commons speech, the former attorney general said Theresa May’s address in the Commons earlier that day had left him ashamed to be a member of the Tory Party.

He described the Prime minister’s performance at the dispatch box in the Commons as “the worst moment I have experienced since I came into the House of Commons".

READ MORE: Poll reveals 90% of people think Brexit is national humiliation​

Grieve said: “I have never felt more ashamed to be a member of the Conservative Party of to be asked to lend her support.

“She spent most of her time castigating the house for its misconduct. At no time did she consider that it might be her misconduct which is contributing to this situation.

“I have great sympathy for her. I’ve known her for many years and have had a personal relationship beyond and outside this house.”

"But I have to say I could have wept ­– wept to see her reduced to these straits, and wept to see the extent to which she was simply zig-zagging all over the place rather than for standing up for what the national interest must be.”

Theresa May today wrote to EU Council president, Donald Tusk, to request an extension to Article 50 until June 30.

Tusk has said a short extension will be possible but is “conditional on a positive vote on the Withdrawal Agreement in the House of Commons".

France, Spain and Belgium, however, are ready to veto a Brexit delay after Theresa May requested an Article 50 extension.

READ MORE: Brexit: France, Spain and Belgium ready to veto Article 50 extension

Grieve QC warned that the Government's credibility "is running out".

He added: "We really are, I'm sorry to say this, at the 11th hour and 59th minute, the Government's credibility is running out, trust in it is running out and unless ... the Prime Minister by some great exertion of will, and she has plenty of will and plenty of robustness, stands up and starts doing something different, we are going to spiral down into oblivion and the worst part of it all is that we will deserve it."