At this point, we absolutely need to hear impeachment testimony from former national security adviser John Bolton. But conservatives and Democrats alike would both be wrong to mistake the ultrahawkish foreign policy expert for a totally impartial witness.

I agree with my colleague Tom Rogan that it is now vital to the integrity of the impeachment process to hear what Bolton has to say. That’s because bombshell reports emerged this weekend based on Bolton’s book manuscript. He supposedly alleges that President Trump told him directly that he was indeed conditioning Ukrainian foreign aid on investigations into Democrats,