Late-night host Stephen Colbert says Russian intelligence agents kept a very close eye on him while he filmed TV segments in St. Petersburg in recent days.

The "Late Show" host on Monday discussed filming in Russia, mixing in a number of digs at President Trump over the investigations into Russian interference in the presidential election, including possible links between members of Trump's campaign and Moscow.

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“You know who did know I was in Russia? Russian intelligence. Hardcore fans, evidently. Followed me everywhere. Also got some attention from American intelligence,” Colbert said.

“It’s important to keep your eye on a comedian while he’s in Russia doing jokes. I could be over there, I could be giving state secrets to the Russians. Oh, wait — someone’s already got that covered,” he added in reference to the investigations.

Colbert said his crew filmed four or five segments, shooting for 13 hours at a time.

Colbert also teased Trump on Twitter, replying to the president's tweets about possible recordings of his conversations with fired FBI Director James Comey.