Starting this week, Vice President Mike Pence will embark on a national tour of congressional districts represented by Democrats who’ve come out in support of the inquiry. The move comes as the administration is struggling to combat an intensifying investigation into President Donald Trump’s dealings with Ukraine.

Each of the districts on Pence’s itinerary were won by Trump in 2016, making them potent targets for Republicans. The vice president will travel Wednesday to the southwest Iowa district of Rep. Cindy Axne, and Thursday he’s slated to visit the suburban Twin Cities district of another freshman Democrat, Minnesota Rep. Angie Craig. The vice president is then scheduled to barnstorm an array of battleground districts, including those held by Michigan Rep. Elissa Slotkin and Virginia Rep. Abigail Spanberger.

The deployment comes as the White House has been flailing for a focused response to the escalating probe into whether Trump improperly pressured Ukraine to investigate Joe and Hunter Biden. The president veered wildly over the weekend, accusing Democrats of “interfering in the 2020 Election” and calling Republican Sen. Mitt Romney a “pompous ‘ass’” who failed to understand that “my conversation with the Ukrainian President was a congenial and very appropriate one.”