Washington (CNN) President Donald Trump said that if Democrats "want to play tough" when they control the House of Representatives next year, he will declassify documents that will be "devastating" to them.

"If they want to play tough, I will do it," Trump told the New York Post in an interview Wednesday . "They will see how devastating those pages are."

Democrats are poised to launch a series of investigations after winning a majority in the House in November. Democratic-controlled committees are likely to probe a range of issues including Russian interference in the 2016 presidential election, Michael Cohen's payments to women who say they've had affairs with Trump (allegations he denies), potential obstruction of justice and Trump's finances.

The President told the Post he wants to save the documents for when he can use them against the Democrats most effectively. "It's much more powerful if I do it then," Trump told the Post, "because if we had done it already, it would already be yesterday's news."

It's not clear what documents he is referring to.

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