WASHINGTON/MINNEAPOLIS (Reuters) - Pressure for sweeping reforms to policing intensified in the United States on Monday after two weeks of protests over the death of African American George Floyd, as the white officer accused of killing him prepared for his first court appearance.

Demonstrators anger over the May 25 death of Floyd, 46, is giving way to a growing determination to make his case a turning point in race relations and a lightning rod for change to the criminal justice system.

Floyd died after Derek Chauvin, the officer, knelt on his neck for nine minutes in Minneapolis. A bystanders cellphone captured the scene as Floyd pleaded with the officer, choking out the words I cant breathe.

Chauvin, due to appear in a Minneapolis court on Monday, has been charged with second-degree and third-degree murder as well as second-degree manslaughter.

Three other officers involved in the incident have been charged with aiding and abetting second-degree murder and aiding and abetting second-degree manslaughter. All four officers have been fired.

In Houston, thousands of people were expected to attend a visitation for Floyd on Monday. Presumptive Democratic presidential nominee Joe Biden plans to meet with Floyds family later in the day, according to his aides.

Floyd, who grew up in Houston, will be buried on Tuesday. Reverend Al Sharpton, a black civil rights leader, is expected to give the eulogy.

Though there was violence in the early days, the protests have lately been overwhelmingly peaceful. They have deepened a political crisis for President Donald Trump , who repeatedly threatened to order active duty troops onto the streets.

Huge weekend crowds gathered across the country and in Europe. The high-spirited atmosphere was marred late on Sunday when a man drove a car into a rally in Seattle and then shot and wounded a demonstrator who confronted him.

Democrats in Congress on Monday unveiled legislation that would make lynching a hate crime and allow victims of misconduct and their families to sue police for damages in civil court, ending a legal doctrine known as qualified immunity.

The legislation also was expected to ban police chokeholds and racial profiling, require nationwide use of body cameras, and subject police to civilian review boards, according to congressional sources.

It is unclear if the proposal would receive support from Republicans , who control the U.S. Senate . Their support and that of the Republican Trump would be needed for the measure to become law.

A Reuters investigation published last month revealed how qualified immunity , refined over the years by the U.S. Supreme Court, has made it easier for police to kill or injure civilians with impunity.