Hoover
Johnson.
No, they can only approve war when the president asked for it
President Roosevelt asked Congress to declare war on Japan, which Congress did.
The president was McKinley
The President asked congress to declare war on Japan, congress agreed.
Franklin D Roosvelt.
Persian Gulf War
In the spring of 1812 president Madison asked congress to declare war on Great Britain. The war lasted almost two years with the United States being victorious.
Polk asked Congress to declare war on Mexico and was President during its duration.
President Johnson asked congress for and received a resolution giving him power to use whatever was necessary to protect U.S. interests in Vietnam on August 7, 1964.
President Teddy Roosevelt, beginning in 1902. Due to the assassination of President McKinley, Congress asked the Secret Service to guard the President.
Polk asked Congress to declare war on Mexico and was President during its duration.