https://mullin.house.gov/contact/
There’s about a dozen of us who have emailed all these morons for two days now.
This takes some work but can be done in about 5 min once you get a zip code.
You'll usually need a little more than that if you go through his website contact form. I emailed this dips**t, through his site, and I needed to have an address in his district for the message to go through. So I used the Durant townhall, which is a town in his patch of dirt.
Come to think of it, maybe that'll work for a voter registration, too. Seems the Dems get to do that all the time...