(WASHINGTON) -- Arizona Sen. Ruben Gallego is under federal investigation for suspected campaign finance violations, a person familiar with the matter confirmed to ABC News.

According to multiple reports, Gallego, a Democrat, used campaign funds to fly his family to the Caribbean, Miami, Nantucket and Puerto Rico. He also allegedly used funds to pay for childcare.

Campaign funds may be used to pay for a candidate’s childcare expenses that are incurred as a direct result of campaign activities, according to the Federal Election Commission.

On Monday, the Senate Ethics Committee closed its inquiry into allegations of sexual misconduct and campaign finance violations after finding no evidence that Gallego violated Senate rules or applicable law, according to a letter released by his office.

In regards to the federal investigation, a Gallego spokesperson told Axios that "it's the least surprising news of the week that this comes immediately after the Senate Ethics Committee cleared Senator Gallego of right-wing smears pushed by the administration."

ABC News has reached out to Gallego's office for comment on the investigation. The Department of Justice has not yet commented on the probe.

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