Former US President Donald Trump landed in Milwauke on Sunday for the upcoming Republican National Convention (RNC) a day after surviving the assassination attempt at his campaign rally in Butler.

Footage shows politician descending the stairs and waving amid heightened security.

During the four-day convention, which unites thousands of Republicans, Trump is expected to be formally elected as their 2024 presidential nominee. Despite the Saturday's accident, the party conference goes as planned.

Trump was shot to his right ear when he was delivering his speech in the rally in Butler, Pennsylvania on Saturday. As rows of shots fired, the candidate ducked behind his lectern and was surrounded by bodyguards before being taken out of the venue, while raising his fist into the air.

The alleged gunman was killed by the US Secret Service agents. Another attendee was also reported dead in the rally, with two others in critical condition.

Following the incident, President Joe Biden made his statements in a speech in Rehoboth Beach, calling it 'sick' and condemning the violent act.

Other US politicians like the former president Barack Obama and Secretary of States Antony Blinken also commented on the shooting, condemning political violence and sending wishes to Trump.

The case is currently being investigated as a possible assassination attempt, according to law enforcement officials.