The United States wants to force other countries to buy more US products: Are US exports abnormally weak?

Donald Trump is using the threat of tariffs in reality to force other countries (especially China and Europe) to buy more US products. But are US exports abnormally weak? Are weak exports the cause of the United States’ external deficit? Indeed, US exports are weaker than those of other countries (only just in the case of Japan), but this may be due to under investment in the United States; The US external deficit is mainly due to the country’s low national savings rate and not to a lack of purchases of US products by other countries.