Washington: US President Donald Trump's lawyer Rudy Giuliani left open Sunday the possibility that Trump and former personal attorney Michael Cohen might have discussed Cohen's congressional testimony.

But, he added, "so what" if he did?

Giuliani appeared Sunday on CNN, where he said he did not know if Trump had discussed with Cohen a 2017 congressional interview at which Cohen has admitted lying about a Trump Tower real estate project in Moscow.

He also acknowledged in a separate interview with NBC News that conversations about that project stretched throughout 2016, including possibly up until October or November of that year.