Whenever Trump is alleged to have done something wrong, he rarely denies it. Instead, he and his supporters attack the person making the allegations, and deflect the attack to a false equivalent regarding Hillary/Obama.
Comey's testimony is more damaging than helpful to Trump. Comey did confirm that he told Trump he wasn't a target in the Russian meddling investigation, but he also said the investigation is continuing and that he couldn't assure the President that he would not be a target if evidence indicated culpability on Trump's part. But Comey is just one benchmark in the investigation of the Russian thing. That's the real purpose here, in the investigations being done by the House and the Senate, but it seems that the right doesn't care about that, because at worst, there may be evidence of complicity by Trump's campaign, or at best, the Trump campaign did not help the Russians, but that Russian efforts helped Trump win, thereby casting a cloud over his victory.
It 's a shame that the bigger issue of an attack by an adversary on our system of government is not important to some people because their man was elected...they say this is a huge waste of time and money...yet the same people were saying the endless investigations into Benghazi were necessary because of serious wrongdoing by a top govt. official(did Hillary lie? -- like Trump and his campaign staff are accused of) and Clinton's private email server (did she expose confidential info?, like Trump's staff is accused of helping a foreign govt)) ...I would bet the right wouldn't have cared as much or perpetuated the endless investigations if Hillary wasn't the expected Dem candidate for President...
The right wanted answers to those questions...but not now...even when the allegations of wrongdoing are more serious and the ramifications are more dangerous for our country.