Interventionists, led by Theodore Roosevelt, wanted war with Germany and attacked Wilson's refusal to build up the army in anticipation of war. After the sinking of the "Lusitania" and the resignation of Bryan, Wilson publicly committed himself to the what became known as the "preparedness movement", and began to build up the army and the navy. In June 1916, Congress passed the National Defense Act of 1916, which established the Reserve Officers' Training Corps and expanded the National Guard. Later in the year, Congress passed the Naval Act of 1916, which provided for a major expansion of the navy.