The impeachment process is fundamentally unfair. Congress lacks authority to investigate the president. Witnesses should have executive branch lawyers.

White House attorneys are throwing out an array of arguments for keeping its officials from cooperating with the congressional impeachment inquiry. But legal experts say they are making a weak case.

Some even say the refusal to cooperate with the probe run by House Democrats could amount to obstruction that might itself become an article of impeachment against President Donald Trump.

"Not only can it be, it absolutely should be," said Heidi Kit...