"The claim of a politically motivated investigation doesn't appear to gel with the facts: we now know that US intelligence agents were warned repeatedly about concerns over Donald Trump and his team's connections to Russia by other spy agencies across the globe: from Germany, Holland, and the UK.
The claim of a politically motivated investigation does gel with the facts. The wiretapping was, by all accounts, largely justified by the Steele/Fusion GPS dossier which has been shown to be a large steaming pile seasoned with a few sparse grains of truth.
There are certain standards that are supposed to be met to obtain a FISA warrant to spy on an American citizen. The evidence to date indicates the FBI didn't meet those standards.