Secretary of Homeland Security Kirstjen NielsenKirstjen Michele NielsenDHS chief takes heat over Trump furor Overnight Cybersecurity: Bipartisan bill aims to deter election interference | Russian hackers target Senate | House Intel panel subpoenas Bannon | DHS giving 'active defense' cyber tools to private sector Hoyer blasts Trump for 'racist rhetoric' MORE said Tuesday that "the president speaks for himself" in his tweet claiming he has access to a bigger nuclear launch "button" than North Korean leader Kim Jong Un.

Nielsen assured reporters that the department is taking steps to prepare for "any possible scenario" that could be a threat to the United States.

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"I think we have to continue, as he said, to take the threat for NK very seriously," Nielsen told reporters. "Certainly at DHS we're doing all we can to prepare for any possible scenario that would involve the homeland, whether it be from North Korea or any other nation state or terror-status area."

President Trump on Tuesday mocked the North Korean leader's New Year's Day speech in which Kim claimed to have a button to launch a strike on the U.S. on his desk. Trump tweeted that he also has a nuclear launch button and his is "much bigger" and "more powerful."

U.S. Ambassador to the United Nations Nikki HaleyNimrata (Nikki) HaleyTrump administration withholds million from UN agency for Palestinians Trump’s first year in office was the year of the woman Palestinian president blasts Trump in defiant speech MORE told Reuters this week that North Korea may soon launch another intercontinental ballistic missile (ICBM), following its most powerful launch to date in November that analysts believe could reach the Eastern U.S.

CBS reported Tuesday that North Korea may be preparing for another ICBM test.

The missile activity, according to CBS News, is at the same site where North Korea launched the November ICBM. That missile was the nation's most advanced to date, capable of reaching the East Coast of the United States, according to analysts.