Many legislators in Congress are more loyal to Israel than to the United States and set favorable conditions for Israel’s “grotesque interference” in American affairs, says an investigative journalist in Wisconsin.

US lawmakers like Senator Charles Schumer, an influential Jewish Democrat from New York, “are dual loyalists, they’re more loyal to Israel than they are to America,” said Wayne Madsen, who is also an author specializing in international affairs.

“People like Schumer and Representative Eliot Engel are more loyal to Israel than they are to the United States,” Madsen said during a phone interview with Press TV on Monday.

Israeli Prime Minister Benjamin Netanyahu has engaged “in grotesque interference in American domestic legislation in Congress,” he added.

“We’re not a colony of Israel but Netanyahu wants to believe that the United States is a colony of Israel; to him we’re nothing more than a Western suburb of Tel Aviv,” he said.

US President Barack Obama said Sunday that Netanyahu has failed to present a better alternative to the negotiated nuclear agreement with Iran.

Speaking to CNN interviewer Fareed Zakaria, Obama pointed to tensions between himself and the Israeli premier over the Iran accord, arguing that Netanyahu's opposition to the deal is wrong.

"Netanyahu’s plan calls for war against Iran,” Madsen said. “His supporters in the US Congress want war against Iran.”

Obama has launched an aggressive campaign of private entreaties and public advocacy to rally enough Democratic support to preserve the nuclear accord ahead of a September vote on it in the Republican-led Congress.