Tesla stock was rising—barely—in early trading Tuesday as shares have suddenly gotten less volatile. Predicting the electric vehicle maker’s daily stock moves isn’t easy, but shares are likely to get a boost from potential changes to President Donald Trump’s car tariffs.

The president signs order exempting carmakers from aluminum and steel levies; he also plans to offer rebates for vehicles finished in the U.S.

President Trump is offering automakers rebates for a portion of the tariffs on auto parts that automakers import to build vehicles in the U.S.