So help me, I am trying like the dickens to grasp the logic behind Donald Trump’s strategy in resisting the impeachment inquiry launched by the U.S. House of Representatives.

The president says he has done not a thing wrong; his phone call with the Ukrainian president was “perfect”; he calls the inquiry a sham, a hoax and a the worst witch hunt in U.S. history.

OK, then why in the world does he obstruct Congress’s efforts to question his key aides, former Cabinet officials, former legal counsel?

The president has employed the same strategy that he used in resisting Robert Mueller III’s probe into alleged Russian “collusion” involving the attack on our electoral system during the 2016 election. He said there was “no collusion, no obstruction,” yet he fought Mueller every step of the way.

Mueller determined that that was no provable conspiracy to collude with the Russians, but left the door open on the obstruction of justice matter.

So, here we are. The House Democratic caucus believes there’s reason to launch an inquiry into whether Trump sought foreign government help to promote his re-election. The House is inquiring into whether impeach Trump. The president says the House is on a fixing expedition. He says there’s nothing to expose.

Why, then, does he keep obstructing Congress? I must be missing something. Help me!