The first part of Monday trade has seen further USD selling pressure. The BBDXY is under 1208, fresh lows back to the end of 2023. Lows from earlier that year in the index were just under 1200. There doesn't appear to be a fresh catalyst for the weakness other than a continuation of Friday's sell-off, with concerns around US trade and fiscal policy dominant drivers.
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Treasury has about $164B in "extraordinary measures" available as of April 23 to avoid hitting the debt limit, per its regular report out Friday. That's out of a maximum total of $375B (they have used $211B).

Liquidity across financial markets including the Treasury market deteriorated after President Trump's April 2 reciprocal tariffs announcement but market functioning was generally orderly, according to the Federal Reserve's semiannual report on financial stability, released Friday. (PDF link is here)
From our Washington Policy Team - Some fairly sharp words today from ex-Fed Governor Warsh on the central bank (who for what it's worth is seen by betting markets as by far the frontrunner for the next Fed Chair):