President Trump will mark his 100th day in office with a rally in Michigan on Tuesday.

But reasons for celebration are in short supply.

Trump’s approval ratings have eroded rapidly since his Jan. 20 inauguration, and the recent tumult in the economy has proven especially damaging.

Beyond the economy, resistance to the president from Americans already skeptical of him has been hardened by controversial actions across a whole range of issues — targeting law firms, pressuring universities, threatening to impeach judges and publicly toying with the idea of seeking a third term.

Trump is, to be sure, still holding many cards. He has a firm grip on the GOP. The support of his base remains fervent. Unauthorized border crossings have dropped dramatically.

Importantly, Democrats are still grappling for direction almost six months after then-Vice President Kamala Harris lost to Trump.

All the same, Trump’s opening stretch back in power has been marred by some deep and self-inflicted political wounds.

Here are his five biggest mistakes so far.

The ‘Liberation Day’ tariffs

Easily Trump’s worst political mistake to date.

On April 2 — “Liberation Day” — Trump announced much heavier tariffs than expected against dozens of nations around the world.

He has inveighed against the supposed unfairness of trading arrangements for decades, and advisers inside and outside the White House like Peter Navarro and Steve Bannon have encouraged him along that path.

He may come to rue it all.

The day after “Liberation Day,” the financial markets cratered — and kept falling. Other nations soon announced plans for retaliatory tariffs, retailers warned of increased prices or supply shortages, and economists predicted that the tariffs would heighten inflationary pressures.

A fundamental problem was exposed, too — the strategy behind the tariffs was, at best, unclear.

Trump and his allies sometimes argue they are intended to spark a rebirth of American manufacturing — an untested thesis that would require holding the levies in place for years.

At other times, they suggest the tariffs are a short-term move intended to wring more favorable trade deals from other nations.

Trump on April 9 bowed to the pressure — from bond markets as well as stock markets growing “yippy,” as he put it — and suspended many of the tariffs for 90 days.

The damage to Trump’s standing on the economy — previously one of his stronger........

© The Hill