Lawmakers are pushing legislation anew that would limit Donald Trump’s ability to launch nuclear weapons on his own after the president taunted North Korea’s leader over the size and lethality of his “nuclear button.”

After North Korean leader Kim Jong-un used part of his New Year’s message to remind the world he has a “nuclear button,” Trump responded with a Tuesday evening tweet about his own atomic button.

“Will someone from his depleted and food starved regime please inform him that I too have a Nuclear Button, but it is a much bigger & more powerful one than his, and my Button works!” the U.S. president tweeted.

North Korean Leader Kim Jong Un just stated that the “Nuclear Button is on his desk at all times.” Will someone from his depleted and food starved regime please inform him that I too have a Nuclear Button, but it is a much bigger & more powerful one than his, and my Button works! — Donald J. Trump (@realDonaldTrump) January 3, 2018

Democrats Sen. Edward J. Markey of Massachusetts and Rep. Ted Lieu of California responded by urging their Twitter followers to express support for a bill they are again pushing that would “prohibit the president from launching a nuclear first strike without a declaration of war by Congress,” according to a fact sheet.