I mean, that was proven. There's an entire wikipedia page dedicated to it [1].
I don't trust this Lindell guy, but I trust the press even less.
1: https://en.wikipedia.org/wiki/Crossfire_Hurricane_(FBI_inves...
The OIG investigation found no support for Trump's claims that President Obama had ordered the wiretapping of Trump Tower.
I don't always trust the press either and some sources much less than others but nothing about how the article characterized Montgomery seems either incorrect, or even exaggerated, to me. He has a history of making sensational claims and then being unable to back them up with actual evidence.
The very first paragraph says that Trump wasn't under investigation. That was a central part of the conspiracy theory.
The other part of the conspiracy was that it was opened to dig up dirt on Trump. But the second paragraph contradicts that as well, saying it was opened because of public statements from George Papandopolous that the Trump team had dirt on Clinton, obtained from Russia.
In some sense, it would be hard to imagine that after making statements like that there wouldn't be an investigation opened. Just because an investigation happened, doesn't mean that it was political or malicious (which was the claim from Lindell).
The very wikipedia page that you linked goes over all of this, including the fact that the claims it was improper were investigated, and dismissed. You don't even have to read the whole thing, it's in the introduction.
That's not what the Washingtontimes wrote.
That's a lot of words that could be been summed up as 'the FBI spied on the Trump campaign.'
Was it legal, justified, moral? Those things are all debatable. I'm firmly on the side that a thin pretense such as 'foreign interference' is no justification for spying on a political campaign.
> including the fact that the claims it was improper were investigated, and dismissed.
What a surprise, the government found itself innocent. Unfathomable.