WASHINGTON (Reuters) - As a financial crisis spread across the globe in September of 2008, the U.S. Federal Reserve gathered in an emergency atmosphere as requests flooded in from other central banks for access to dollars.

U.S. Federal Reserve Chairman Jerome Powell arrives for a G-20 Finance Ministers and Central Bank Governors' meeting at the IMF and World Bank's 2019 Annual Spring Meetings, in Washington, April 12, 2019. REUTERS/James Lawler Duggan/File Photo

The “swap lines” that the Fed quickly approved helped ease intense financial stress in foreign markets, but also showed the U.S. central bank was prepared to stand behind the global system.

Would an “America First” Fed do the same?

The question is suddenly relevant for global economic officials and central bankers after moves by President Donald Trump to put two strong partisans on the Federal Reserve board.

Both economic commentator Stephen Moore and businessman Herman Cain have been critical of Fed policies, and Moore in particular has opposed the extraordinary measures employed to stabilize the economy through the deepest crisis since the Great Depression.

Should Trump shape a Fed that answers first to his politics, it could roil the landscape for other central banks, and for a dollar-dependent world financial system whose fortunes can swing dramatically based on Fed decisions.

“I’m certainly worried about central bank independence in other countries, especially ... in the most important jurisdiction in the world,” said European Central Bank President Mario Draghi, in Washington for spring meetings of the International Monetary Fund and World Bank.

SENSITIVE MOMENT

Trump’s decision to consider close political allies for the central bank comes at a sensitive moment for the world economy and the IMF. Fund Managing Director Christine Lagarde last week asked member countries to strive to “do no harm,” yet its largest shareholder, the United States, has become a concern.

Trump’s ongoing trade battles have been cited as a reason global growth is slowing, and the idea of a Fed stacked with officials looking first at the U.S. political calendar has overseas central bankers nervous.

The IMF has commended the steady evolution of Fed policy under chairman Jerome Powell, but Trump has demanded he cut rates and Moore has endorsed the idea.

The actions of one central bank often impacts the economies of other nations. But the rule of thumb is to set policy as much as possible on the basis of detached analysis, not to gain a short-term trade or political advantage.

If the Fed were to cut rates to counter a U.S. slowdown, it would be one thing. But juicing a mostly healthy economy to make Trump look good would send a bad signal - and hurt countries that are grappling with their own economic problems.

Lower rates could weaken the dollar, boosting U.S. exports and appealing to a core Trump campaign aim of expanding U.S. manufacturing jobs. But it would make it harder for the Bank of Japan to follow its own strategy of targeting specific levels for long-term bond yields, and undercut growth in Europe that the European Central Bank is trying to support. Emerging markets could see destablizing capital flows.

“Can a politicized Fed be relied on to do what it did in 2008, when it was lender of last resort for the world? You would really have to worry about this - that rather than be the strongest proponent of stability, the Fed all of a sudden becomes an agent of instability,” said Jacob Funk Kirkegaard, a senior fellow at the Peterson Institute for International Economics.

Already some of Trump’s policies have European financial leaders thinking about ways to boost the euro as a reserve currency on views the oversized influence of the dollar in global markets leaves Europe vulnerable to U.S. political decisions.

POOR HISTORY FOR POLITICIZED FED

Both Moore and Cain have yet to be nominated formally, and Cain’s prospects look bleak. Fed governors must be approved by the U.S. Senate, and enough Republican lawmakers have come out against Cain to scuttle his chances.

Moore, meanwhile, has sent mixed signals about his policies, but in general has criticized the Fed flooding markets with dollars during the crisis and its aftermath. He has favored tying the Fed to a strict rule, based on commodity prices. Critics of rule-based monetary policy cite its lack of flexibility to respond to unexpected events.

The Fed has had deeply political governors before, perhaps most notably in the 1980s when a group loyal to then-President Ronald Reagan opposed policy set by then-Chairman Paul Volcker, said William English, the former head of the Fed’s monetary affairs division and now a professor at Yale.

They didn’t succeed, English said, evidence of the influence of a strong Fed chair and of the limits an individual governor has in an institution with a strong technocratic bent, and on a policy panel that at peak strength includes 19 people. Twelve of them, moreover, are appointed by regional banks outside the president’s reach.

But before Volcker, he said, the Fed did mold policy around the demands of Presidents Lyndon Johnson and Richard Nixon, and arguably contributed to the runaway inflation of the 1970s.

“We did that experiment...The outcome was bad,” he said.

For the IMF and other global institutions, there’s a broader issue if the world’s dominant economy steers away from the norms recommended for other countries, as the Trump administration has already done on trade. Whether it is the potential for unhindered government borrowing or a politicized central bank, the United States may be writing a script that other, less resilient countries, may be tempted to follow.

“The Fund likes to live in a world....where all of its members are treated evenhandedly,” said Nathan Sheets, former under secretary of the Treasury for international affairs and now chief economist at PGIM Fixed Income. If the United States starts opening the Fed to partisan politics or shifting away from other norms, “that is a risk for them.”