The White Houseon Thursday clashed with President-elect Donald Trump's transition team over alleged Russian interference in the 2016 election.

"It is just a fact that the Republican nominee for president was encouraging Russia to hack his opponent because he believed it would help his campaign," White House spokesman Josh Earnest said during the daily briefing.

The remarks came one day after Earnest suggested on Wednesday's briefing that Trump was aware before Election Day that Russia was involved and "their involvement was having a negative impact on his opponent's campaign."

Senior Trump adviser Kellyanne Conway on Thursday took a shot at Earnest, calling his remarks on Wednesday "incredibly irresponsible."

"He essentially stated that the president-elect had knowledge of this (hacking), maybe even fanned the flames," said Conway in an interview with Fox News. "It's incredibly irresponsible and I wonder if his boss, President Obama agrees."

During his campaign, Trump at one of his news conferences in July did encourage the Russians to hack his rival Democrat Hillary Clinton's email system and reveal the contents.

"I will tell you this, Russia: if you're listening, I hope you're able to find the 30,000 emails that are missing," said Trump, referring to half of the emails deleted from Clinton's private email server because they were claimed by Clinton as containing private information.

The Trump team later characterized that remark as a joke.