Sally Bercow, wife of Commons Speaker John Bercow, has continued to tweet about reports she is receive a letter from Lord McAlpine's legal team.
She maintains her post was "not a libellous tweet":
Thanks for phone calls/texts/tweets. I guess I'd better get some legal advice then. Still maintain was not a libellous tweet - just foolish
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PM spokesman's comments come following reports that the EU is secretly drawing up plans for greater military cooperation across the EU.
The Labour politicians put their alleged differences aside to jointly highlight how remaining in the EU could help fight climate change.
Late sunshine here and there this evening - but more cloud for southern Scotland, northern England and Northern Ireland again.