Sen. Maria Cantwell Maria Elaine CantwellHillicon Valley: Zuckerberg acknowledges failure to take down Kenosha military group despite warnings | Election officials push back against concerns over mail-in voting, drop boxes Bipartisan senators call for investigation of popular fertility app The Hill's Coronavirus Report: Mike Roman says 3M on track to deliver 2 billion respirators globally and 1 billion in US by end of year; US, Pfizer agree to 100M doses of COVID-19 vaccine that will be free to Americans MORE (D-Wash.) has called for an expanded probe into Interior Secretary Ryan Zinke Ryan Keith ZinkeTrump extends Florida offshore drilling pause, expands it to Georgia, South Carolina Conspicuous by their absence from the Republican Convention Trump flails as audience dwindles and ratings plummet MORE's travel following a report he used government helicopters to transport himself and his staffers between locations and events in close proximity to Washington, D.C.

"I'm calling on @Interior Inspector General to add @SecretaryZinke's use of taxpayer-funded helicopter rides to the ongoing investigation into his use of taxpayer-funded private jets. If he misused public funds, he should write the treasury a check for the full amount & apologize," Cantwell said in a tweet on Friday.

I'm calling on @Interior Inspector General to add @SecretaryZinke's use of taxpayer-funded helicopter rides to the ongoing investigation into his use of taxpayer-funded private jets. If he misused public funds, he should write the treasury a check for the full amount & apologize. — Sen. Maria Cantwell (@SenatorCantwell) December 8, 2017

Cantwell's call comes after Politico reported that travel logs show Zinke spent over $14,000 on the helicopter trips, which were provided by the U.S. Park Police.

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The Interior Department’s inspector general launched an investigation in October into Zinke’s use of chartered planes after it was reported Zinke and his aides had taken multiple flights on chartered or military planes to travel to his home state of Montana, as well as to travel to events between two Caribbean islands.

The office has not confirmed whether its probe involves Zinke's helicopter use.

"We are taking a comprehensive look at the secretary's travel since he took office," Nancy DiPaolo, the inspector general's spokeswoman, told CNN.

Zinke's office is pushing back on the reports, calling them "garbage."

"After a congressional hearing, the Secretary attended an official Congressional event with the new Congressman from Montana (who replaced him) and the Speaker of the House before going to an emergency management briefing," Interior spokeswoman Heather Swift said.

"On the other occasion he did an aerial survey of a power line corridor, which was pending before the Department, while traveling back from meetings in southern Virginia in order to get to a meeting with the Vice President," she continued.