US President Donald Trump has warned that any country that does business with Russia will be "very severely sanctioned", as his administration and Republican lawmakers push ahead with tough legislation targeting Moscow.

Responding to questions from reporters on Sunday on whether it was time for Congress to pass measures aimed at pressuring Russian President Vladimir Putin, Trump said, "I hear they're doing that, and that's okay with me."

"They're passing legislation...the Republicans are putting in legislation... very tough sanctioning... on any country doing business with Russia. They may add Iran to that... I suggested it," he said.

"So any country that does business with Russia will be very severely sanctioned. We may add Iran to the formula," Trump reiterated.

The Trump administrat

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