Vermont Sen. Bernie Sanders’ 2018 re-election campaign spent nearly $300,000 on private jet services in October, a report from the Federal Election Commission shows.

Sanders, a climate change hawk, went on a campaign blitz involving nine states to stump for Democratic candidates ahead of the November midterm elections, according to VTDigger. His aggressive campaigning likely served as a preamble for the independent senator’s potential bid for the 2020 Democratic nomination for president.