Texas's 15th congressional district in the context of Hidalgo County, Texas

John Nance Garner III (November 22, 1868 – November 7, 1967), known among his contemporaries as "Cactus Jack", was the 32nd vice president of the United States, serving from 1933 to 1941 under President Franklin D. Roosevelt. A member of the Democratic Party, Garner served as the 39th speaker of the U.S. House of Representatives from 1931 to 1933, having been a U.S. representative from Texas from 1903 to 1933. Garner and Schuyler Colfax are the only politicians to have served as presiding officers of both chambers of the U.S. Congress as speaker of the House and vice president of the United States. He was the longest-lived vice president in U.S. history, dying at the age of 98.

Garner began his political career as the county judge of Uvalde County, Texas. He served in the Texas House of Representatives from 1899 to 1903 and won election to represent Texas in the U.S. House of Representatives in 1902. He represented Texas's 15th congressional district from 1903 to 1933. Garner served as House Minority Leader from 1929 to 1931, and was elevated to Speaker of the House when Democrats won control of the House following special elections in 1931 (Republicans actually retained control immediately after the 1930 elections, but lost as several seats shifted parties).

The 2020 United States House of Representatives elections in Texas were held on November 3, 2020, to elect the 36 U.S. representatives from the state of Texas, one from each of the state's 36 congressional districts. The elections coincided with the 2020 U.S. presidential election, as well as other elections to the House of Representatives, elections to the U.S. Senate, and various state and local elections. Primaries were held on March 3, and run-offs were held on July 14.

During the election cycle, a number of House races were considered vulnerable by Democrats and polls. However, in the wake of the election, Republicans were able to retain control over all of those seats. Democratic-held 15th district also became unexpectedly competitive, with incumbent representative Vicente Gonzalez attaining a narrow win over the Republican challenger. Republican wins were attributed to President Donald Trump appearing on the ballot and his unexpectedly strong support from Latino voters.