According to Paul Ryan - 160 other countries charge some form of import taxes on goods made outside of their countries. They also do not charge export taxes to their companies who export their goods to the US or other countries.
The US doesn’t charge import taxes but does tax exports. The US would collect
By imposing import taxes on foreign-made goods, the US could collect $1 trillion from other countries by charging these import taxes to those foreign businesses who export foreign-made goods into the US.
According to President Trump, these import taxes would be established through negotiations of bilateral trade agreements we would negotiate with each country.
A bilateral trade agreement with a country that has, for example, a 10% import tax on US made automobiles, could end up agreeing to lower it to match the 5% import tax we might be proposing to charge for their foreign made automobiles.
Norb Leahy, Dunwoody GA Tea Party Leader