President who used the tonkin gulf incident as an excuse to deepen u. s. involvement in the vietnam war

Lyndon B. Johnson--the Gulf of Tonkin involved the attack of a US ship off the coast of Vietnam. 

With the Gulf of Tonkin incident, Lyndon B Johnson was able to show Americans the threat Vietnam posed for the United States. This incident allowed Johnson to increase the number of troops in Vietnam and create an official war for the US. A draft was started after this incident and interest in Vietnam increased for the US.