Sheriff Joe Arpaio Stumps for Trump at the Republican National Convention

Arpaio has long been a lightning rod for his staunch anti-immigration policies.

Arpaio, who walked onto the stage at the convention to resounding applause, has been a lightning rod for scandal since his election in 1993, largely because of his staunch policies, which many view as anti-immigrant.

"Now more than ever we must have respect for the police," he said. "The highest levels of government must have our back."

He became a known figure on the national stage after challenging the authenticity of Barack Obama's birth certificate, a point of view that he shared at that time with Donald Trump. Arpaio has been closely allied with Trump throughout his rise to the top of the Republican ticket, and relished the opportunity to provide security to Trump at his rallies.

Arpaio has also been criticized for failing to investigate several sex crimes, including cases of child rape.

The sheriff has conceded investigative failures in his special-victims unit regarding sex crimes, and said that it was not uncommon for police agencies to struggle with such matters, according to the Arizona Republic. He said that he believed that his agency he was being singled out, the paper said.

Arpaio has been accused of racial profiling, and abuse of power at times in his career, but he has also won fans among hard line conservatives, nationalists and other people concerned about undocumented immigration for his perceived toughness in enforcing border laws.

His attorneys have fiercely denied all allegations of racial profiling, according to the Arizona Republic.

This week, a judge presiding over a racial profiling case against Arpaio handed down punishments against the octogenarian lawman for his decision to prolong immigration patrols months after he was told to stop them.

U.S. District Judge Murray Snow ordered an overhaul of internal affairs investigations at the Maricopa County Sheriff's Office after previously finding Arpaio in civil contempt of court for disobeying him, according to the the Associated Press.

Additional penalties are expected, the report said.