Is Collusion a Crime?

 https://www.findlaw.com/criminal/criminal-charges/is-collusion-a-crime.html

In March 2019, Special Counsel Robert Mueller issued his final report to then-Attorney General William Barr. He stated that Russia had interfered in the election in support of Trump. But, he concluded that there was insufficient evidence to show conspiracy or coordination between the Trump campaign and Russia. The report highlighted several instances where Trump's actions raised issues of obstruction of justice. Federal crimes involving obstruction of justice can be found in 18 U.S. Code Section 1505.

Prior Department of Justice guidance says the government should not bring criminal charges against a sitting president. In light of this, Mueller said it would be up to Congress to decide whether there was cause to pursue charges or other sanctions. Many saw this as an allusion to Congress' ability to use the impeachment process.