According to a report from New York University’s Tandon School of Engineering, the president’s reelection campaign has poured $3.2 million into Facebook ads in the state since July 1.
The NYU Tandon Online Transparency Project, which monitors online ad-spending, was built by computer science and engineering teacher Damon McCoy and doctoral student Laura Edelson.
Nationally, the president has invested $59 million in Facebook ads since July, while Biden has spent $39 million.
It is unclear whether the campaign will continue to do so as the president is treated for COVID-19 at Walter Reed National Military Medical Center.
The former astronaut is the third-highest political ad spender in Arizona. His opponent, incumbent Republican Sen. Martha McSally, has spent a fraction of that amount at just over $281,700.
As the Biden campaign has ramped up digital and television ad spending – even following the first presidential debate this week – the Trump campaign has attempted to parry, buying out critical space on YouTube’s homepage.