Mexico will wait and see if U.S. President Donald Trump goes through with his threat to slap tariffs on its southern neighbor on Tuesday, the nation's president said on Monday, adding that Mexico has back-up plans in case the tariffs go into place.

Little about how Trump discusses tariffs is normal — not only because he threatens tariffs on a weekly, even daily, basis, but also because it's often unclear if or when those tariffs will happen.

Mexican officials are in Washington for talks this week and President Claudia Sheinbaum said she would speak with Donald Trump again by phone if needed.