The Progressive Party (often referred to as the "Bull Moose Party") was a third party in the United States formed in 1912 by former president Theodore Roosevelt after he lost the presidential nomination of the Republican Party to his former protégé and conservative rival, incumbent president William Howard Taft. The new party was known for taking advanced positions on progressive and populist reforms and attracting leading national reformers. After the party's defeat in the 1912 presidential election, it went into rapid decline in elections until 1918, disappearing by 1920. The Progressive Party was popularly nicknamed the "Bull Moose Party" when Roosevelt boasted that he felt "strong as a bull moose" after losing the Republican nomination in June 1912 at the Chicago convention.