The U.S. dollar edged lower on Monday, as the U.S. government is partially shut and the greenback is recovering from last week’s Federal Reserve interest-rate increase.

With no apparent solution on the horizon, the government shutdown could last into the New Year, when the new Congress returns from a holiday break, market participants said.

On Tuesday, major exchanges will be closed for Christmas, while currency markets remain open. Trading volumes are expected to be thin all week and next Monday as well, New Year’s Eve.

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Besides the shutdown, there were reports late Friday that President Donald Trump discussed firing Fed Chairman Jerome Powell — something Treasury Secretary Steven Mnuchin later denied.

Still, “sentiment is so negative right now that markets will assume the worst. Such a move to oust Powell would be disastrous, to state the obvious,” wrote Win Thin, head of global currency strategy at Brown Brothers Harriman.

Trump took to Twitter on Monday, saying the only problem the U.S. economy had was the Fed.

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But that wasn’t the only closely watched tweet. Earlier, Mnuchin tweeted that he spoke to major banks to ensure that they held proper liquidity, perhaps sparking concerns that didn’t previously exist.

Read:Treasury Department’s odd attempt to reassure investors may have just backfired

“Markets are left with a couple of possible interpretations. At best, Mnuchin made a rookie policy mistake in trying to reassure markets. At worst, Mnuchin knows something that the markets don’t,” Thin said.

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Amid all this, the ICE U.S. Dollar Index DXY, -0.01% is down 0.5% at 96.519, after dropping 0.5% last week when the Fed policy statement guided to fewer interest rates hikes than before in the year to come.

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Dollar rivals benefited from the buck’s Monday weakness.

The euro EURUSD, +0.01% climbed to $1.1414 from $1.1370 late Friday in New York, while the British pound GBPUSD, +0.11% rose to $1.2718, compared with $1.2630, touching its highest level in more than two weeks.

Against the Japanese yen USDJPY, -0.07% the dollar fell to ¥110.39, down 0.8%, now at its lowest since late August, according to FactSet data.

The only data point from the U.S. on Monday was the Chicago Fed national activity index, which came in at 0.2%.