The latest report on Wednesday said that a special counsel was appointed to probe into Trump campaign’s ties to Russia. The news came only days after Trump fired the former F.B.I Director James Comey.

However, not everybody seems to be so thrilled by the decision, as Trump expresses over the Twitter that he is the victim of “the single greatest witch hunt of a politician in American history!”

The Late Show host Stephen Colbert took the effort to explain to Donald Trump better about what’s going on. He took an extra time during his Monologue on Thursday, to explain exactly how this special counsel was appointed as well as why the Trump administration should feel concerned about it.

“When a special counsel gets appointed to investigate your administration just four months in, that’s a new high in low,” he said.

Watch here: