She hopes to win over Tory Brexiteer MPs and Northern Ireland's DUP, by resolving their concerns over the "backstop" plan for the Irish border.

Last week, Mrs May said she would focus on cross-party talks to get a Brexit deal accepted by Parliament.

Downing Street insisted that cross-party talks were continuing.

The backstop is the "insurance policy" in the withdrawal deal, intended to ensure that whatever else happens, there will be no return to a visible border between Northern Ireland and the Irish Republic after the UK leaves the EU.

Both the UK and the EU believe that bringing back border checks could put the peace process at risk. But a way of avoiding those checks has yet to win over MPs.

The DUP, which keeps Mrs May's minority government in power through a deal to support it in key votes, rejected her Brexit deal last Tuesday, but 24 hours later helped her see off a bid to oust her in a no confidence motion, saying it didn't want a change of government, just a change of policy.

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