WASHINGTON (Reuters) - U.S. Central Intelligence Agency Director Mike Pompeo on Thursday defended talks he had at CIA headquarters last week with Russian spy chiefs at a time of strained ties between Washington and Moscow and political squabbling over allegations of Russian meddling in the 2016 U.S. election.

FILE PHOTO: CIA Director Mike Pompeo delivers remarks at "Intelligence Beyond 2018," a forum hosted by the American Enterprise Institute for Public Policy Research, in Washington, U.S., January 23, 2018. REUTERS/Leah Millis/File Photo

A U.S. intelligence official, speaking on condition of anonymity, accused Moscow of disclosing the visit partly to fuel political discord in Washington over investigations of a Russian interference campaign that is rankling President Donald Trump and some of his fellow Republicans.

The U.S. Senate’s top Democrat Chuck Schumer wrote to Director of National Intelligence Dan Coats on Jan. 31 asking why U.S. intelligence officials met with Sergey Naryshkin, the head of Russia’s foreign intelligence agency, known as the SVR.

“We periodically meet with our Russian intelligence counterparts for the same reason our predecessors did - to keep Americans safe,” Pompeo replied to Schumer in a letter made public on Thursday. There is nothing “untoward” about such meetings, Pompeo said.

“We cover very difficult subjects in which American and Russian interests do not align,” Pompeo said. “We vigorously defend America in these encounters and pull no punches - we never will.”

The Russian Embassy in Washington did not immediately respond on Thursday to requests for comment on the meetings.

The Russian officials’ visit was made public on Tuesday by the state-run ITAR-Tass news agency and the Russian ambassador to Washington Anatoly Antonov tweeted the report.

Pompeo’s reply to Schumer failed to satisfy the senator.

“This letter is responsive to approximately none of the questions that were raised about these visits,” Schumer’s spokesman, Matt House, wrote on Twitter.

Moscow denies the conclusions of U.S. intelligence agencies that it led a hacking campaign of political party networks and spread disinformation to help Trump in his presidential campaign. Congressional panels and a special counsel are investigating. Trump denies any campaign collusion with Russian officials.

Among other questions, Schumer asked how Naryshkin was able to enter the United States because he is under U.S. sanctions barring him from the country. Naryshkin was blacklisted in 2014 as part of the U.S. response to Russia’s seizure of Crimea from Ukraine.

Naryshkin met with DNI Coats at Coats’s suburban Washington headquarters, according to two sources. A third source said that the SVR chief met Pompeo at CIA headquarters in Langley, Virginia.

Naryshkin was accompanied by Alexander Bortnikov, the director of the Federal Security Service, or FSB, Russia’s main domestic intelligence agency, the third source said.

The U.S. intelligence official told Reuters that “it was no accident that Russia decided to publicize” the visit after years of not disclosing meetings between U.S. and Russian intelligence officials.

It appeared to be “a calculated effort” that “not only sowed discord in the United States but also reinforced the notion that they (Russia) are not isolated internationally,” said the intelligence official, who spoke on condition of anonymity.

Washington has been gripped this week by arguments over a Republican memo said to cite allegations of FBI bias against Trump in its Russia probe. The memo is a flashpoint in a wider battle between Republicans and Democrats over Special Counsel Robert Mueller’s criminal investigation into potential collusion.

Pompeo’s letter to Schumer said that meetings between Russian and U.S. intelligence agencies include counter-terrorism cooperation in which the CIA recently helped Russia thwart a “terrorist plot” in St. Petersburg “that could have killed Americans.”