US Democratic presidential candidate Bernie Sanders is accurate in comparing Bill and Hillary Clinton to the country’s oligarchy who are ruling the US and “squeezing” the middle and lower class households, an investigative journalist in Washington says.

“Senator Sanders has hit the nail on the head; Hillary Clinton and her husband do represent an oligarchy,” said Wayne Madsen, an author and columnist specializing in intelligence and international affairs.

“These are the upper one percent of the one percent in the United States who are doing quite well and the rest of the country isn’t,” Madsen said during a phone interview with Press TV on Monday.

“Oligarchs like the Clintons and the Bushes and others are squeezing the American working people to the point where they’re angry and that anger is either now manifested in support for Sanders from members of the liberal wing or Democratic Party or their support for Donald Trump, who actually shares many of Sanders’ beliefs about Wall Street and the oligarchs and the bad trade agreements that have cost the United States so many jobs,” he added.

Sanders pressed his line of attack again on Sunday that “Wall Street and other special interests” support Clinton, the candidate who wants to bring “oligarchy” to the country.

Sanders also criticized Clinton over fundraising on ABC's ‘This Week With George Stephanopoulos,’ calling into question whether big ticket fundraisers belong in the Democratic Party.

Clinton attended two fundraisers co-hosted by Hollywood actor George Clooney over the weekend in California. The price tag for a ticket to dine with her at the event was $34,000.

Sanders has repeatedly condemned America’s huge wealth inequality, lack of universal healthcare and a corrupt campaign finance system, drawing significant support for his presidential campaign.

He is now hoping to defy expectations in New York state’s primary elections on Tuesday, where the most recent polls showed him trailing Clinton by about 17 points.