The National Republican Senatorial Committee marked their best January fundraising haul after pulling a record $5.58 million last month.

NRSC communications director Jesse Hunt confirmed the number to the Washington Examiner on Wednesday.

Chaired by Indiana Sen. Todd Young, the NRSC is the official arm of the Republican Party responsible for electing Republicans across the country to the Senate. The announcement marks the first month of fundraising under Young's leadership after he was elected by the Senate GOP caucus to head the effort in early January.

The NRSC raised over $151.5 million for the 2018 election cycle, outraising their Democratic counterpart, where the GOP increased its majority in the Senate by two seats. Figures for the Democratic Senatorial Campaign Committee's January fundraising month have yet to be released by the Federal Election Commission.

Senate GOP is facing plenty of competitive races going into the 2020 election cycle, including Iowa Sen. Joni Ernst, Colorado Sen. Cory Gardner, and Maine Sen. Susan Collins. All states where Democrats did well in the 2018 midterm elections and are increasingly vulnerable seats according to latest generic ballot polling.

[Also read: Bernie Sanders leaps into 2020 race with $6M raised in 24 hours]