Tenure
Grijalva was elected as a Democrat to the 108th Congress in 2002, representing Arizona's seventh congressional district. As a freshman congressman, the first bill he sponsored was H.R. 731, the Tohono O'odham Citizenship Act of 2003. Although the bill was not passed into law, it sought to grant American citizenship to all members of the Tohono Oʼodham. This federally recognized tribe has land that stretches from their reservation in Arizona across the U.S.–Mexico border into the Mexican state of Sonora, resulting in some of its members not being U.S. citizens.
In 2015, Grijalva settled a complaint accusing him of drunkenness and a "hostile workplace environment" with a female staffer who had been at her job for three months. The $48,000 payment was made from House of Representatives funds.
For his tenure as the chair of the House Natural Resources Committee in the 116th Congress, Grijalva earned an "A" grade from the nonpartisan Lugar Center's Congressional Oversight Hearing Index.
In 2019, Grijalva was the subject of an Ethics Committee probe relating to his alcoholism and creating a "hostile workplace." He repeatedly came under fire for alcohol use, but denied alcoholism.
Grijalva was at the U.S. Capitol on January 6, 2021, to certify the 2020 presidential electoral college votes when the Capitol was attacked by Donald Trump supporters. Moments after Grijalva finished speaking in support of certifying Arizona's votes, rioters started banging on the doors of the House chambers. He called the attack "one of the darkest and most shameful days of our republic" and the perpetrators "domestic terrorists." Grijalva blamed President Donald Trump for inciting the attack and called for the 25th Amendment to be invoked to remove Trump from office. After the 25th Amendment was not invoked, Grijalva supported impeaching Trump a second time. He voted to impeach Trump again on January 13, 2021.
In February, Grijalva voted in support of the American Rescue Plan, which included a nationwide $15 federal minimum wage increase. However, the Senate Parliamentarian removed the increase from the bill. As a result, Grijalva joined a group of progressive Democrats in calling to overturn the Parliamentarian's ruling.
Grijalva voted with President Joe Biden's stated position 100% of the time in the 117th Congress, according to a FiveThirtyEight analysis.
During the 118th Congress, Grijalva returned to serve as the ranking member of the House Natural Resources Committee.
Only three months into his 12th term in Congress, Grijalva died after battling lung cancer. He was succeeded by his daughter, Adelita Grijalva in a special election later that year to serve out the remainder of his term.