The geopolitical risk likely will push any rate increase until at least July, despite apparent consensus among Fed officials that a hike is warranted by stronger U.S. growth and tight labor markets.

The Fed’s June 14-15 rate-setting meeting comes just a week before the British vote on June 23. A “leave” vote is expected to roil financial markets, cause credit spreads to widen, trigger a rush into safe assets and bolster the dollar.

The dollar’s recent stability is one reason the Fed has become more comfortable with raising rates, and officials may want to let the threat of Brexit pass before moving to tighten financial conditions.

Fed Board Governor Daniel Tarullo on Thursday joined the chorus of those warning of his concerns over the British vote, telling Bloomberg that Brexit would be a “factor” he would consider at the Fed’s June policy meeting and said that the British vote’s impact on markets would be key.

The most recent poll found that voters in Britain—Europe’s second biggest economy and its most influential financial center – were evenly split on whether to stay in the EU or to leave.

By the time the Fed meets on June 14 and 15, at least four of the five Washington-based governors will have aired their views on the outlook for rates, with Lael Brainard due to speak Friday and Chair Janet Yellen appearing in Philadelphia next week.

Fed officials will release their latest economic projections at the June meeting along with a policy statement, and Yellen is scheduled to hold a post-meeting news conference.

The two governors who have addressed the Brexit vote so far have sounded notes of caution.

“I do see the possibility of a real hit to economic growth both in the U.K and the EU,” Fed Board Governor Jerome Powell said last week. “I can imagine the upcoming Brexit vote as presenting a factor in favor of caution about raising rates.”

Secret meetings across Europe reveal uncertainty over what would follow a vote that British Prime Minister David Cameron calls a “leap in the dark”—and also concern about what happens if Britain stays in.

If Britain remains in the EU, it could lead to continued infighting in the ruling Conservative party and destabilizing battles with the rest of the EU.

Waiting on the Brexit vote is a “no-brainer,” said Jon Faust, a former Fed staffer and now a professor of economics at Johns Hopkins University. “Why move now as opposed to a few weeks from now?”

Consensus on Caution

With few exceptions, the message from regional Fed bank presidents has been consistent: the upcoming Brexit vote may tip the scales against a June increase.

This is only the latest obstacle to the Fed’s two-year struggle to normalize U.S. monetary policy after dropping rates dramatically during a protracted downturn.

In 2014, the crash in oil prices and a rapid spike in the value of the dollar crushed U.S. exports and drove inflation into a ditch.

Last year, a surprise slowdown in China’s economy, alongside the malaise in Europe and Japan, sparked global market turbulence and broader concerns about a worldwide recession. That vexing landscape kept the Fed on hold until December.

Now, Brexit aside, the prospect of a rate hike soon appears all but certain. Unemployment dropped to 5% in April; inflation appears to be gaining traction as the drag from cheap oil and a strong dollar fades; and the lull in growth over the past few months has proved temporary, with consumer spending and the housing market showing particular strength.

The probability of a June rate increase is now about 17%, according to Fed funds futures trading data compiled by the CME Group, compared to 57% for July.

While the impact of a vote to leave the EU is uncertain, one widely expected and immediate result is likely to be a jump in the value of the dollar—a further blow to U.S. exporters and another drag on inflation that the Fed still considers too low.

July Over June

If the Fed does indeed take a pass at its June meeting, officials have signaled they’ll be ready to move in July.

Minutes of the Fed’s March policy meeting showed officials preparing the ground for higher rates sometime in the summer months. After July, the next option would be September, in the middle of a U.S. election campaign, in which the Fed and Yellen could well become targets of debate.

Four of the Federal Reserve’s 12 regional bank presidents have asked to raise the interest rate charged to commercial banks for short-term loans—a proxy for saying the target rate should move higher.

If the board defers a rate hike at its June meeting, Yellen will face a rhetorical challenge in explaining why global factors are again trumping domestic economic data—when Fed officials have tried to convince the public that their decisions are “data dependent.”

One approach she could take, economists said, is to flag the Fed officials’ agreement in favor of gradual rate rises over the next couple of years, but to emphasize that low inflation means there is no urgent need to start raising rates right away, especially ahead of such a one-time and potentially critical world event.

“Even if Brexit were seen to be an unlikely outcome, we think this extremely cautious Fed Chair might see relatively little cost to waiting another seven weeks to act,” RBS economists Michelle Girard and Kevin Cummins said in a note.