The Scottish Conservatives are holding their conference in Aberdeen on March 18 and 19, at the same time as the UK spring conference in Blackpool, meaning Mr Johnson may address the Scottish gathering virtually.
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A Scottish Conservatives spokesman said: “The Prime Minister will be invited to address party conference, just as has been the case in any other year.”
Mr Ross was among the Tory MPs who wrote to the 1922 Committee chairman Sir Graham Brady seeking to trigger a no confidence vote.
The move prompted Jacob Rees-Mogg, then the leader of the House, to called the head of the Scottish Conservatives a “lightweight”
However, Scottish Secretary Alister Jack said Mr Ross had his “full backing”.
Speaking in the House of Commons last week, Mr Jack said: “Douglas Ross absolutely is the leader of the Scottish Conservatives, he is put there by the membership because we’re a constitutionally devolved organisation, he’s doing a very good job, he holds Nicola Sturgeon to account and he has my full backing.”
On Friday, Downing Street confirmed that Mr Johnson had received a legal questionnaire from Met officers investigating events in No 10.
He now has seven days to adequately explain his attendance or face a fine for breaking his own Covid regulations.