Secretary of Homeland Security Kirstjen NielsenKirstjen Michele NielsenSessions responds to Nazi comparisons: 'They were keeping the Jews from leaving' Trump digs in amid uproar on zero tolerance policy McCain calls on Trump to rescind family separation policy: It's 'an affront to the decency of the American people' 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) HaleyUN human rights head: Trump policy separating migrant families is abuse Anti-Trump Republicans better look out — voters might send you packing US expected to withdraw from UN Human Rights Council: report 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.