U.S. Congress Republicans and the White House are on a collision course the moment Congress begins its session on Sept. 8 as conservatives threaten to tie a budget bill with the president's immigration policies that could possibly lead to a government shutdown.

Tensions between the Obama administration and Congress arose after Josh Earnest, White House spokesman, announced on Wednesday that Republican tactics would not affect President Obama's decision to ease immigration rules.

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"The president is determined to act where House Republicans won't," Earnest said. He said it would be a shame if the conservatives opt to shut the government down over an obvious solution to the immigration problem.

President Obama insists to implement executive actions on immigration with the support from businesses, labor unions, religious leaders and law enforcement in spite of the House Republican’s oppositions, Earnest added.

Reports said that by the time lawmakers return to Congress on September 8, Republicans would have limited time to agree on federal agencies' funding. If no agreement is reached before Oct.1, the beginning of the new fiscal year, the federal government will face the risk of another shutdown.

Last year, the U.S. Congress was in the same disposition. Senator Ted Cruz (R-Tx), together with other lawmakers the Tea Party supported, used a spending bill to quash the White House' Obamacare. The result was a 16-day shutdown of federal agencies that lacked funds to operate.

While the White House urges Congress to act on President Obama’s plan, adding the immigration debate could complicate and might trigger a domestic crisis when the new fiscal year starts, reports said.

If Republicans continue to oppose President Obama's plan, it could spark a battle over the bigger bill to keep the government operating, the White House budget office spokeswoman said.

Iowa Republican Rep. Steve King said during a conservative meeting that if the president acts to legalize five million undocumented immigrants, it would become something nearly political nuclear.

King added that lawmakers should push for the passage of a House legislation on border security as a requirement in exchange for funding the federal agencies, some reports confirmed.

However, several U.S. officials said the threat of government shutdown will not deter the president from implementing the executive order.

According to some sources, the White House advised that delaying the immigration budget would have a negative impact on U.S. economy.

Tagsimmigration, budget showdown, U.S., Congress, Obama