U.S. President Donald Trump celebrated the 100th day of his second term through a campaign-style speech, touting his achievements and targeting political enemies.

He called what he called a "common sense revolution" and told a group of Michigan supporters that he was using his presidency to achieve "deep change."

Republicans mocked his Democratic predecessor, Joe Biden, and raised new criticisms to the U.S. Federal Reserve chairman while refuting polls that showed his own decline in popularity.

Trump has created a huge trend in the number of immigrants entering the United States illegally, but the economy is a potential political vulnerability in launching a global trade war.

"We're just starting out and you haven't seen anything yet," Trump told the crowd in a suburb of Detroit on Tuesday.

Speaking at the Center for Automation Industry in the United States, Trump said auto companies are "queuing up" to open new manufacturing plants in the Midwest states.

Earlier in the day, he softened the key element of the economic plan - imposing tariffs on foreign cars and auto parts.

Trump also said at the rally that polls showed his popularity had fallen "fake".

According to Gallup, Trump was the only president after World War II to receive less than half of the public support after 100 days in office, with a 44% approval rate.

But most Republican voters remain firmly supportive of the president. Competition Democrats are also struggling in the vote.

The Democratic National Committee (DNC) said Trump's first 100 days were "a huge failure."

"Trump should blame life for being more expensive and harder to retire, and the 'Trump recession' is at our doorstep," the DNC said.

Trump conducted his own informal poll in his speech Tuesday, asking the crowd to provide their favorite Biden nickname. He also mocked the Democratic ex for his mental agility and even laughed at his appearance in his swimsuit while continuing to insist that he was the real winner of the 2020 election, and he lost.

Other targets he was angry with included Jerome Powell, the head of the U.S. Central Bank, who the president said was not doing well.

Trump touts the progress of immigration – the southern border’s suffering fell to more than 7,000, down from 140,000 in March last year.

The White House also said that so far, nearly 65,700 immigrants have been deported during his tenure, although this is slower than the previous fiscal year when U.S. authorities deported more than 270,000.

Trump screened a video through his speech, which was expelled from the United States and sent to a super prison in El Salvador.

His immigration crackdown faces a series of legal challenges, as does his efforts to end the automatic grant of citizenship.

In his speech on Tuesday, he insisted that egg prices fell 87%, a claim that contradicts the latest government price figures.

Inflation, energy prices and mortgage rates have fallen since Trump took office, and despite a slight increase in unemployment, consumer sentiment has fallen and stock markets are trapped in turmoil by tariffs.

Before the speech, Joe DeMonaco, who owns a woodworking business in Michigan, said that another piece of import tax that Trump has pieced together starts raising prices and he will have to pass it on to clients.

"I hope … because he's a little bit experienced, because he's a little bit experienced," Mr Demonaco told the BBC. "But we're just stomping on the water and see if things will get better."

But it is clear that Trump's most determined supporters support him.

Teresa Breckinridge, owner of Silver Frying Pan Restaurant in Atlanta, Georgia, told the BBC.

“He has to deal with anything possible multiple times a day and he is reporting to the people…I think the tariffs will definitely be favored by us in the end.”