Perhaps no other foreign policy area brought forth the emotional anti communism characteristic of the 1950s as did American relations with the People's Republic of China. The so–called “ loss of China ”issue beginning in 1949, for which the Republicans primarily blamed the Democrats, severely strained the bipartisan approach towards foreign policy. In addition, four years before he died in 1951, Republican foreign policy leader Senator Arthur H. Vandenberg excluded China policy from the area of bipartisan agreement, while his party's loyalty to the defeated Nationalists remained strong. Senator Joseph McCarthy's“communists–in– government” charges during the Korean War, when American forces were engaged in combat with the People's Liberation Army, further exacerbated relations between the Republican and Democratic parties, and between the legislative and executive branches of government. Ominously, the possibility of a preventive strike on the China mainland also became the focus of serious consideration and possible implementation during the Formosa Strait confrontation of 1954–55.