[mikeash]

There are good arguments that he already has. But ultimately, it doesn't matter. Although technically speaking he needs to break the law to be impeached, in practice you just need a majority of the House to impeach, and two thirds of the Senate to convict. If Congress doesn't want to remove the President, it doesn't matter what laws he breaks. If Congress does want to remove him, then they'll find some legal excuse to justify it. There's no official oversight of the process, nobody to say "no, that crime didn't happen" or "that crime doesn't qualify for impeachment."