Former Republican presidential nominee Mitt Romney will appear at two fundraising events for Sen. Jeff Flake Jeffrey (Jeff) Lane FlakeRepublican former Michigan governor says he's voting for Biden Maybe they just don't like cowboys: The president is successful, some just don't like his style Bush endorsing Biden? Don't hold your breath MORE (R-Ariz.) in June, according to a Tuesday Politico report.

Romney will reportedly attend both a reception in Phoenix as well as a luncheon in Tucson on June 2.

Both events aim to raise funds for Flake’s 2018 reelection bid, Flake's adviser Steve Voeller told Politico.

Flake is considered to be one of only two potentially vulnerable Senate Republicans on the ballot in 2018. A frequent critic of President Trump, he could also be open to a primary challenge from the right.

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During the 2016 presidential election, Romney himself emerged as a prominent GOP voice against Trump's nomination. But Romney eventually became a contender for secretary of State, before Trump picked ExxonMobil Corp. CEO Rex Tillerson.