National Republicans are investing another $3 million to boost Sen. Susan Collins' reelection campaign in Maine as Democrat challenger Graham Platner struggles to regain momentum following a string of controversies.

Most recently, the GOP-aligned One Nation super PAC announced a new $3 million ad buy touting the Maine senator's record of securing investments for the state and advocating for veterans.

The spending comes on top of earlier support from Republican organizations, including Pine Tree Results PAC, as national Republicans move to fortify one of their most important Senate seats.

The spending, first reported by the Washington Examiner, comes as Republicans seek to solidify Collins' position in one of the nation's most closely watched Senate races.

The veteran Republican is seeking a sixth term in a state Democrats have long targeted as a potential pickup opportunity.

The latest investment from GOP-aligned groups follows months of turbulence for Platner, the presumptive Democrat nominee.

Once viewed as a rising star with strong fundraising and grassroots support, Platner has been dogged by a series of damaging revelations that have complicated his bid to unseat Collins.

Among the controversies are reports that Platner exchanged sexually explicit messages with multiple women after his 2023 marriage, criticism of past social media posts, and questions surrounding a tattoo that critics linked to Nazi symbolism. Platner has denied any extremist intent.

Most recently, a New York Times report detailed allegations from former girlfriends who accused Platner of abusive and misogynistic behavior. Platner has strongly denied the allegations, calling them politically motivated and "just not true."

One of the women featured in the Times article, Lyndsey Fifield, later accused the newspaper of downplaying allegations against Platner and omitting more serious allegations from other women. She said the newspaper's handling of the story amounted to "a gift to the Platner campaign."

Despite the controversies, recent polling shows the race remains competitive. A survey released this week found Collins and Platner tied among likely voters, though Platner's unfavorable ratings have risen sharply amid the negative headlines.

Republicans appear determined to capitalize on the Democrat's troubles.

The additional $3 million signals that GOP strategists believe Collins remains well-positioned but are unwilling to leave anything to chance as Democrats continue their push to flip the seat in 2026.