Allegations that a police officer falsely claimed to have witnessed former chief whip Andrew Mitchell calling police "plebs" are "exceptionally serious", No 10 says.
Mr Mitchell, who resigned from his post over the incident in Downing Street, has called for a full inquiry.
Last night, Channel 4 News accused the officer of falsely claiming to have seen the events in an email to his MP.
Interviewed by the Today programme's Justin Webb, David Davis MP, who is a supporter of Mr Mitchell's, explained that: "of course he swore, we know that, but the so called toxic word [that was alleged to be used]... does not fit with the CCTV footage."
When asked whether swearing at a police officer was legitimate, he said: "If that was an issue... they should have resolved that issue at the time."
The issue was "made around the word 'pleb'... that's what was important", he said.
This is a "serious injustice" and explained that Mr Mitchell "should be returned to office".
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