President Donald Trump cannot have committed impeachable offenses in seeking to thwart or disparage Special Counsel Robert Mueller's investigation of his and his campaign's "collusion" with the Russians to manipulate the 2016 election. Trump's opposition to the Mueller investigation could not have constituted "obstruction of justice."
That's because Trump was the victim of a "malicious prosecution." As such, he was within his personal rights to defend himself against what was in effect defamation, by protesting his innocence and questioning the motives for the prosecution.
English and American law has long tried to restrain abuse of police, prosecutorial and judicial processes by giving the victims of such abuses a remedy in damages from those who instigate or abet "malicious prosecutions."
The grounds for seeking damages after a prosecution are: 1) that no proper probable cause existed to start the prosecution; 2) that the effort produced no finding of criminality, and 3) that the victim's accusers acted out of malice.
An action for malicious prosecution involves similar standards to a civil suit for defamation by a public figure. The plaintiff needs to show: 1) falseness in the accusation and 2) actual malice on the part of those making the false allegation.
The Mueller probe of collusion with Russia was undertaken without proper probable cause. The grounds for the accusation of wrongdoing came from the Steele dossier, which is false and defamatory.
Second, the Mueller report found no collusion-related crime on Trump's part or his campaign's.
The third element supporting a claim of malicious prosecution, malice in the accusers, is easily shown.