Democratic Sen. Kyrsten Sinema received the legal maximum of donations from several known GOP donors, new FEC filings show

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• Arizona Sen. Kyrsten Sinema received the maximum donation allowed by law from several GOP donors.
• Donors previously donated to pro-Trump PACs and a PAC to elect Republicans to the Senate.
• Sinema, a Democrat, has positioned herself as a key obstacle to President Joe Biden's agenda.

Arizona Sen. Kyrsten Sinema, a Democrat, received the maximum donation allowed by law by several longtime GOP donors, according to a campaign fundraising report filed Friday with the Federal Election Commission.

According to the FEC data, first reported by Mother Jones, Sinema raised $1.1 million between July and September this year, about the same amount she raised in previous fundraising cycles, according to the report, despite growing frustration among Arizona Democrats.

Included in the FEC disclosure are several GOP donors who have previously supported efforts to elect former President Donald Trump and to help Republicans get the majority in the Senate. The maximum individual contribution limit is $2,900 per election, with a maximum of $5,800 in a two-year period, according to FEC guidelines.

Among those who made the maximum donation was Minnesota billionaire Stan Hubbard, who regularly donates to the RNC and supported Scott Walker and eventually Trump's campaign for president through donations to a super PAC, Mother Jones reported.

Jimmy Haslam, the owner of the Cleveland Brown's and Pilot truck stops, and his wife, Susan, individually donated the maximum legal amount to Sinema on September 30, Mother Jones reported, citing the FEC data. According to the report, Haslam has given at least $425,000 to the Senate Leadership Fund, a super PAC associated with Sen. Mitch McConnell that works to elect Republicans in the Senate.

Other GOP donors who backed Sinema include Marc Rowan, the CEO of the private equity firm Apollo who backed Trump's failed bid for reelection, and his wife, Carolyn, who individually donated the maximum legal limit. Private equity executive Anthony De Nicola, who also has backed the Senate Leadership Fund, also donated the maximum legal limit to Sinema, according to Mother Jones.

Progressives and other Democrats have grown frustrated with Sinema, who has made headlines in recent months for her reluctance to support key pieces of President Joe Biden's agenda. Sinema is currently fundraising in Europe, per The New York Times.

Both Sinema and West Virginia Sen. Joe Manchin have been opposed to parts of a Democratic spending plan to invest in climate, education, and healthcare spending. While Manchin has been clear about wanting to cut the price tag of the proposal, it's largely unclear what Sinema would support, as Insider previously reported.

Sinema, however, has reportedly been opposed to raising tax rates for individuals and large corporations, said two Senate Democratic aides familiar with the matter. Her position threatens to deprive the package of over $700 billion in revenue to pay for Biden's "Build Back Better" agenda.

Sinema, a first-term lawmaker, is not up for re-election until 2024.