Peter Navarro, a senior White House trade adviser, defended President Trump’s tariffs, but the Treasury secretary said the U.S. might be ready to negotiate. Peter Navarro, a senior White House trade adviser, defended President Trump’s tariffs, but the Treasury secretary said the U.S. might be ready to negotiate. Navarro, Peter, Protectionism (Trade), Customs (Tariff), Trump, Donald J, CNBC NYT > Business