The Secret Service has acknowledged it denied some requests by Trump's campaign for increased security at his events in the years before the assassination attempt.
Harris, 59, is mostly likely to be the presidential nominee of the Democratic party now that she has been endorsed by President Joe Biden, who announced on Sunday that he will not seek re-election, as well as other top party leaders including former president Bill Clinton.
Indian-American businessman-turned-politician Vivek Ramaswamy had predicted some eight months ago that incumbent President Joe Biden would not be the presidential nominee of the Democratic Party.
Embattled US President Joe Biden on Sunday announced that he will end his candidacy for re-election in 2024 and endorsed Vice President Kamala Harris as the Democratic Party's new nominee, saying "it is in the best interest of my party and the country".
"Crooked Joe Biden is the worst president, by far, in the history of our nation. He has done everything possible to destroy our country, from our southern border to energy dominance, national security, international standing and so much more," Trump said.
In the rally in Michigan on Saturday, Trump, who is the Republican presidential nominee for the November 5 elections, was joined by his running mate JD Vance.
Illegal immigration, he said, has resulted in crime, corruption and inflation.
Most of the media reports said that Biden's announcement on his re-election bid might come after the conclusion of the Republican National Convention in Milwaukee.
Former United States President Donald Trump will focus on national unity and share his personal stories in his acceptance speech on Thursday as the presidential nominee of the Republican Party for the November election, days after he faced an assassination attempt.
Former United States President Barack Obama and ex-House Speaker Nancy Pelosi have spoken to President Joe Biden and informed him that his path to victory against his Republican rival Donald Trump has greatly diminished and it might have an impact on other Congressional and Senatorial races as well, according to media reports on Thursday.
Introducing Vance, a junior United States senator from Ohio, to their fellow Americans, Usha described the love and affection of her husband.
Indian-American Republican leader Nikky Haley has endorsed her former boss Donald Trump as the party's candidate for the presidential election, delivering the message of unity after their bitter rivalry during the presidential primary.
Born Usha Chilukuri, she has carved out a distinguished career in the legal field, having clerked for Supreme Court Justices John Roberts and Brett Kavanaugh before Kavanaugh's nomination to the court.
"There is no place in America for this kind of violence, for any violence ever. Period. No exceptions. We can't allow this violence to be normalised," Biden said.
Melania reflected on what the incident means for her and her family while calling for the country to "ascend above the hate".
The shooter, as per FBI, used an AR-style rifle chambered in 5.56mm, a common calibre for such weapons.
Former United States president Donald Trump was injured after being shot in the ear during an apparent assassination attempt at an election rally in Pennsylvania after which a male attacker was shot and killed by a member of the Secret Service.
This evening, President Biden spoke to former President Trump. The President also spoke to Pennsylvania Governor Josh Shapiro and Butler Mayor Bob Dandoy, the White House said.
Cutting across party lines, leaders strongly condemned the attack on Trump while he was addressing an election rally in Butler, which is about 56 km north of Pittsburgh in Pennsylvania.