SALEM -- Oregon Secretary of State Dennis Richardson said Tuesday that his agency has identified two addresses receiving a suspicious number of ballots -- but cautioned that no actual voter fraud was found.

In an interview with The Oregonian/OregonLive, Richardson said the state Elections Division examined addresses receiving more than 10 ballots and found two that appear to be "fraudulent."

More than 6,500 addresses in Oregon receive at least 10 ballots, most of them retirement homes and fraternity or sorority houses, he said. The fact that only two appeared to be engaging in possibly fraudulent activity should reassure Oregonians that election systems are performing well, he said.

"I said, 'Really? Only two?' I was pleasantly surprised at that," Richardson said.

He declined to disclose the two addresses in question and said the Elections Division is investigating the situation.

Richardson recently wrote a letter to President Donald Trump to assure him that if voter fraud took place during last year's presidential election, it wasn't in Oregon.

"I'm pleased to report that in Oregon we have reviewed the processes and we are confident that voter fraud in last November's election did not occur in Oregon," Richardson wrote. "In short, elections in Oregon cannot be hacked."

He also asked Trump to roll-back an Obama-era designation of elections systems as "critical infrastructure," which some secretaries of state have criticized as a move to give the federal government more authority over election systems. Richardson told Trump that "federal intrusion into Oregon's election process should be rejected."

Richardson wrote in a newsletter Tuesday that the critical infrastructure designation was "foisted on the states without consultation" and is akin to federal overreach.

"The urgency is this, once a federal agency assumes authority to intervene in a state's constitutional duty to conduct fair elections, such an encroachment will be nearly impossible to supplant," Richardson said. "There has been no information released by either President Obama's or President Trump's administrations to justify this 'critical infrastructure' designation, so I am fighting it."

As for his letter to Trump, Richardson told The Oregonian/OregonLive that the Trump Administration hasn't written back.

Richardson visited Washington D.C. last week for a secretaries of state conference and stopped at the Eisenhower Executive Office Building, situated across the street from the White House. But he didn't get a response from the Trump Administration -- which he characterized as disorganized.

"They were still trying to figure out how to furnish the conference rooms, where to put the desks," Richardson said.

-- Gordon R. Friedman

gfriedman@oregonian.com.