WASHINGTON - As the US federal government shutdown stretches into its third week, Treasury Secretary Scott Bessent warned that the closure is already beginning to weigh on the real economy.

"This is getting serious. It's starting to affect the real economy," he told Fox Business on Monday, without providing further details.

Bessent added that the government has been forced to "shuffle things around" in order to ensure military pay, leading to delays or suspensions of payments to other federal employees and services, including the Smithsonian museums and the National Zoo. He also confirmed that workers are being furloughed nationwide.

On Oct 1, the first day of the shutdown, consultancy EY-Parthenon estimated that each week of closure would trim about 0.1 percentage point from quarterly US GDP, equivalent to roughly $7 billion in losses, while Politico, citing a White House memo, reported that the weekly economic hit could reach $15 billion, potentially resulting in 43,000 additional job losses if the shutdown persists.

The Senate is due to reconvene on Tuesday and vote again on a House-passed funding measure. But it has already fallen short of the 60-vote threshold seven times. Senate Republicans have tried to win Democratic support, yet largely failed.

The political stalemate centers on disputes over health insurance subsidies under the Affordable Care Act - Democrats insist they must be preserved, while Republicans demand the government be reopened first.

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House Speaker Mike Johnson told reporters on Monday that he would not negotiate with Democratic lawmakers until they dropped policy demands on healthcare.

Accusing Democrats of "hostage-taking" with their posture in the government shutdown, Vice-President JD Vance on Sunday said, "We don't negotiate with a person who has taken the entire federal government hostage over a health care policy dispute."

Public sentiment is fracturing on the deadlock. A poll led by Reuters and Ipsos last week showed that 67 percent of Americans place significant blame on Republicans, compared with 63 percent on Democrats.

As the impasse between the Democrats and Republicans drags on with no end in sight, the Trump administration has activated large-scale layoffs across federal agencies, including Commerce, Education, Energy, Health and Human Services and Treasury.

According to USA Today, nearly 750,000 federal employees have been furloughed and ordered not to report to work. Others, including military personnel and air traffic controllers, are required to continue working without pay until a budget deal is reached.

The US government has experienced 15 shutdowns since 1980. Triggered by Democrats' opposition to Trump's proposed funding for the US-Mexico border wall, the previous 35-day shutdown from 2018 to 2019, the longest in US history, forced some 800,000 federal employees to work without pay or take unpaid leave.

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"We're barreling toward one of the longest shutdowns in American history," warned Johnson, who leads Republican lawmakers, as the current standoff shows little sign of resolution.