"Mr. Comey was concerned by information showing possible evidence of collusion"

In the weeks before President Donald Trump fired FBI Director James Comey, a federal investigation into potential collusion between Trump associates and the Russian government was heating up, as Mr. Comey became increasingly occupied with the probe.

Mr. Comey started receiving daily instead of weekly updates on the investigation, beginning at least three weeks ago, according to people with knowledge of the matter and the progress of the Federal Bureau of Investigation probe. Mr. Comey was concerned by information showing possible evidence of collusion, according to these people…

FBI and Senate investigations into Mr. Flynn, which had been looking into the
nature of his contacts with Russia before he joined the White House, expanded in recent weeks to include an examination of Mr. Flynn’s tenure as Mr. Trump’s chief security adviser, people familiar with the probe said…

Investigators are interested in companies that have done business with Mr. Trump or have connections with him, said people familiar with the matter.