News of the World

[DerVVulfman]

House Intelligence Transcripts: Top Obama Officials saw no Russian Collusion
https://www.foxnews.com/politics/intel-t...-collusion
“I never saw any direct empirical evidence that the Trump campaign or someone in it was plotting/conspiring with the Russians to meddle with the election,” former Director of National Intelligence James Clapper testified in 2017.
“The transcripts show a total lack of evidence, despite Schiff personally going out saying he had more than circumstantial evidence that there was collusion”
"Mueller, similarly, at the conclusion of his nearly two-year-long investigation, said he and his team found no evidence of criminal conspiracy or coordination between the Trump campaign and Russia..."

A lawyer would say that there was no predication to continue based on the lack of evidence. Or more simply put, they didn't have any evidence to support a warrant... a warrant to have the U.S. go through over two years of Russia Collusion Conspiracy and the Mueller Investigation.