Brexit-backing MPs are so wound up that one fears he is being bugged by spies, it emerged today.
Tensions have revealed themselves in a surprising way as Theresa May ticks down the days to needing a deal at an EU summit this Wednesday.
Last-minute horse trading over the status of Northern Ireland has sparked a furious double attack on Mrs May from both her DUP allies and Tory MPs.
But it seems she’s not the only one watching her back.
According to the Sunday Times, an unnamed former member of the government ended a call with a journalist when he detected “ambient noise changes” on the line.
He believed this to be electronic surveillance by the security services, it is reported.
It comes amid a torrent of new claims in Sunday newspapers that Mrs May is just a few MPs from a leadership challenge – and a mass Cabinet resignation could tip events over the edge.
Mrs May will meet 27 EU leaders on Wednesday for a make-or-break dinner to nail down an agreement ahead of votes in the EU and the UK Parliament.
But Brussels is still demanding customs checks on food and goods between Northern Ireland and Great Britain, which has infuriated the DUP .
Meanwhile a separate row has exploded with Tory Brexiteers over a backup plan that they say would destroy the ambition of Brexit .
Mrs May is thought to be looking at dropping a December 2021 end date for her “backstop” plan, which would temporarily keep the whole of the UK in the EU customs union.
The plan would prevent a hard border in Northern Ireland while a better deal is found.
But Brexiteers warn it will ban the UK from striking new trade deals around the world.
Ex-Brexit Secretary David Davis declared it was time for Cabinet ministers to “exert their collective authority” – even if it means defying the PM.