John Dowd, a former personal lawyer for President Trump, donated twice to the president’s reelection campaign this year even though he already reached the $2,700 contribution limit, prompting a warning letter this month from the Federal Election Commission.

Dowd’s additional donations of $3,700 were included in a list of contributions to Trump’s committee in the second quarter of 2018 that the FEC categorized as “excessive, prohibited and impermissible.”

In its letter to the Trump campaign, the FEC flagged at least 180 other cases in which individuals gave multiple donations beyond the limit.

Dowd gave to the campaign in April and May, bringing his total contributions for the cycle to $6,400. When asked whether he was aware that he had exceeded the limit, Dowd responded in an email that he was “not aware.”

Under federal election rules, individuals can give a maximum of $2,700 to a campaign committee for a primary election and $2,700 for a general election, for a total of $5,400 in a campaign cycle.

A Trump campaign representative said Dowd’s excessive donations were not solicited and were refunded.

Dowd, who was Trump’s top attorney dealing with an investigation by special counsel Robert S. Mueller III, resigned from his position in March after he clashed with the president over strategy disputes.

This is the second instance in which the FEC has flagged impermissible donations from Dowd to the Trump campaign.

In March, the FEC noted that he had given the reelection committee a total of $3,000. At the time, an attorney representing Dowd blamed “FEC reporting software” for the excessive payment. The Trump campaign refunded Dowd $300.

In its Aug. 16 letter to the Trump campaign, the FEC flagged dozens of instances in which individuals appeared to have made excessive contributions, including some totaling more than $6,000. Several donors gave more than $2,700 in increments of $200 or less, according to the letter.

A campaign official said that the committee tracks contributions to make sure they do not exceed the legal limit, but that some information does not get updated immediately, such as when donors use different addresses. They noted that the vast majority of donations to the committee were within the limits.

Unlike his predecessors, Trump began raising money for his reelection campaign soon after he won the presidency. With more than two years to go until the next presidential election, Trump’s campaign and two affiliated committees have raised at least $90 million.