Business executives have been in a state of limbo over Donald Trump's fluctuating plans to impose major tariffs since he took office in January. Tuesday's announcement does not end that uncertainty.

Trump’s tariffs on Canada and Mexico are due to start Tuesday, but the polling and economic dynamics point to political peril.

There are going to be tariffs on Tuesday on Mexico and Canada — exactly what they are, we’re going to leave that for the president and his team to negotiate.” Meanwhile in Mexico: The Mexican government has its own tit-for-tat response to Trump’s complaints about fentanyl smuggling,