(CNN) The top Democrat on the House Natural Resources Committee said Tuesday that he has moved past personal attacks by former Interior Secretary Ryan Zinke and he would keep investigating Zinke's tenure despite his resignation.

Asked by CNN's Erin Burnett whether he would move on from Zinke's insults, Grijalva said yes.

"Yes, because I think ... he's got serious problems that he has to deal with in terms of the investigations, in terms of the oversight our committee is going to do," he said on "Erin Burnett OutFront." "The issue is Interior, the issue is conservation, the issue is science, and the issue is our jurisdiction in protecting the many interests we have there, including Indian Country -- so that's the job ahead."

When Grijalva called for Zinke to resign in an op-ed last month, Zinke shot back on Twitter that it was "hard for (Grijalva) to think straight from the bottom of the bottle."

"This is coming from a man who used nearly $50,000 in tax dollars as hush money to cover up his drunken and hostile behavior. He should resign and pay back the taxpayer for the hush money and tens of thousands of dollars he forced my department to spend investigating unfounded allegations," Zinke wrote in the tweet

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