By John Towfighi, CNN

New York (CNN) — Markets thought they had a serious debt problem. Now they have a trade war problem to worry about again.

Stocks and the dollar fell Friday after President Donald Trump brought the trade war back to the forefront with threats of massive tariffs against one of America’s most valuable companies and one of its most important trading partners.

Trump posted on Truth social Friday morning that he would impose a 25% tariff on Apple if it refused to make iPhones in the United States. Minutes later, Trump said he would recommend a 50% tariff on goods imported from the European Union.

The Dow closed lower by 256 points, or 0.61%. The broader S&P 500 fell 0.67%, and the tech-heavy Nasdaq Composite slid 1%.

All three indexes finished the week in the red. The Dow and Nasdaq each posted their worst week in five weeks. The S&P 500 notched its worst week since the first week of April.

Dow futures had tumbled as much as 600 points Friday morning after Trump posted his tariff threat. Stocks opened sharply lower before paring losses throughout the day after Treasury Secretary Scott Bessent said in a Bloomberg TV interview that he expects “several large deals” will be announced in the coming weeks.

Bessent also said he expects US and Chinese officials to meet in person again to continue trade negotiations following a temporary pause on higher tariff rates.

While stocks recouped some losses, the major indexes remained in the red as Trump said at the White House in the afternoon he was “not looking for a deal” with the EU.

Trump’s stark tariff threats paired with Bessent’s optimistic trade remarks sent Wall Street’s fear gauge, the CBOE Volatility Index, on a rollercoaster. The VIX was up 8% in the afternoon after surging as much as 23% in the morning.

The US dollar index, which measures the dollar’s strength against six major foreign currencies, slid 0.8%. The dollar index posted its biggest single-day drop in one month and notched its worst week in six weeks. Gold, a safe haven during uncertainty, surged 2%.

“Markets once again face the fear of high tariffs on a major trading partner,” said Rob Haworth, senior investment strategy director at US Bank Asset Management.

“We believe that this morning’s social media posts about a 50% tariff on the EU are primarily a negotiating tactic,” analysts at Barclays said in a Friday note. “But today’s developments, including the posts about iPhones, do highlight that the US has not turned the page on tariffs and that more trade policy volatility lies ahead.”

Tariffs back in focus

Wall Street in recent weeks had begun to shift focus away from tariffs and toward Trump’s tax bill — its own headache for markets — after the United States and China in May opened trade negotiations and agreed to substantially lower tariffs, easing investors’ nerves about the trade war.

But Trump’s new threat of tariffs on the EU was a sharp reminder that policy uncertainty remains. David Doyle, head of economics at Macquarie, said in a recent note that it is not “all-clear” on the trade war front, and tariffs remain a “substantial headwind” to the US economy.

“Today’s early market action does not approve of a threat directed at another corporate, and the idea of a 50% EU tariff rate,” analysts at Citi said in a Friday note. “This is sure giving us déjà vu.”

The S&P 500 sank in early April after Trump announced massive “reciprocal” tariffs, and rebounded sharply after the president a week later announced a 90-day pause on most of them. Investors have been on edge about potential developments during the 90-day pause, which is set to end in July.

“This calls into question whether investors can trust that any pauses announced by the Administration are actually solid, which only further muddies the landscape,” said Ross Mayfield, investment strategist at Baird. “Expect volatility to persist.”

Scott Ladner, chief investment officer at Horizon Investments, said the market reaction to Trump’s threat of 50% tariffs on the EU will likely be more “measured” than past tariff announcements because “the playbook now involves a high likelihood of Trump caving at some point.”

“But the uncertain timing and not-zero chance that he doesn’t cave will keep equities on edge for the next couple of weeks, at least,” Ladner said.

The United States so far during the 90-day pause has only announced a trade deal with the United Kingdom.

Apple (AAPL) on Friday dropped 3% after Trump’s threat to impose tariffs on the company’s products unless it moves manufacturing to the United States. The tech giant has tumbled 22% this year as it has been caught in the crossfire of Trump’s trade war.

Apple’s market value dipped back below the $3 trillion mark on Friday as its stock stumbled.

And it’s not just Big Tech taking a hit. Retirement plans like 401(k)s are often invested in funds that track the S&P 500, and large companies like Apple make up a notable portion of the index’s value. As Trump’s trade war roils blue-chip stocks like Apple, it can impact people’s retirement savings.

“You just can’t continue to keep an economy and companies operating in a cloud of extraordinarily high uncertainty forever without some economic consequences eventually,” Ladner said. “That’s going to be the tug of war the next several months.”

The tariff jolt on Friday comes after markets this week have already been floundering under pressure from the bond market. Investors this week balked at Trump’s “big, beautiful” tax bill, and weak demand for US government bonds sent yields surging.

“Markets are looking for a little more fiscal discipline, they’re concerned,” Federal Reserve Governor Chris Waller told Fox Business on Thursday.

“There does seem to be, you know, a risk-off on American assets across the board, not just government debt, but everything,” Waller said. “And whether that continues in the future or not, I don’t know.”

The yield on the 10-year Treasury note on Friday edged lower to 4.51% as investors scooped up bonds amid renewed trade uncertainty.

In Europe, markets tumbled after Trump’s threat of a higher tariff for the region that could go into effect June 1. The benchmark STOXX 600 index fell 0.93%. Germany’s DAX fell 1.54% and France’s CAC index slid 1.65%.

The S&P 500 posted its fourth day of losses in a row as the recent rebound in US markets has stalled. The benchmark index is down slightly on the year.

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CNN’s Elisabeth Buchwald contributed reporting.