The pound fell sharply after an exit poll in Britain's election forecast that the Conservatives would fall short of a majority in parliament, raising the prospect that the country might not have a clear victor or strong government as it starts its negotiations to leave the European Union.
It's not clear whether the relationship will now become more public, delegations walking up Downing Street, or whether they'll keep their bartering behind closed doors.
With the smaller parties more closely aligned with Labour than with the Conservatives, the prospect of Corbyn becoming prime minister no longer seems fanciful.
Johnson tweeted that an article in the Mail on Sunday newspaper headlined "Boris set to launch bid to be PM as May clings on" was "tripe". The DUP may provide the missing votes.
"We have done no deals and no pacts with anybody, we're there as the Labour Party with our points of view".
A government led by the Labour Party could, however, shore up the currency, he says.
Chancellor Philip Hammond, meanwhile, is reported to have told the Prime Minister that she needed to put "jobs first" in negotiating a new deal with Brussels, in comments seen as a coded attack on her focus on controlling immigration.
Jeremy Corbyn vowed to lead Britain out of the European Union as he insisted Labour is "ready any time" for another general election.
David Mundell calls for DUP to change position on LGBTI issues
Jeremy Corbyn , leader of the Labour Party , had said that his party will call on others to stop May from forming the government . The deadline for the Conservatives' first attempt is June 19, the date of the annual Queen's Speech.
He later added: "She called the election to strengthen her hand, there will be two questions Conservative MPs are considering right now".
Above all, investors are anxious about the general uncertainty surrounding the country - whether a bruised May will be able to govern effectively or whether she may eventually resign.
And the other thing, I think, which I think caught us by surprise was the sheer effectiveness of the campaigning by Jeremy Corbyn, the left-wing leader of the Labour Party who fought a very authentic campaign - quite an old fashioned campaign, in some ways - with big open-air rallies where he really energized people.
A "confidence and supply" arrangement is a far looser deal than a formal coalition or pact. Confidence and supply arrangements mean that the DUP will back the government if a vote of no confidence is held, and in cases of "supply" - effectively backing the government's budgets.
The alliance makes some modernizing Conservatives uneasy.
The DUP was founded in the 1970s by the late firebrand preacher Ian Paisley, and in the 1980s was a key player in the "Save Ulster from Sodomy" campaign, which unsuccessfully fought against the legalization of gay sex in Northern Ireland.
"I asked for a categoric assurance that if any deal or scoping deal was done with the DUP there would be absolutely no rescission of LGBTI rights in the rest of the United Kingdom, in Great Britain, and that we would use any influence that we had to advance LGBTI rights in Northern Ireland", said the MP, who is a lesbian.
Instead, her strategy backfired as the election took away the Conservative majority and sent the country into political turmoil. The speech will be followed by several days of debate and a vote. But a far more significant deadline is the Queen's Speech on June 19, when the sovereign will read out the legislative programme of the new government.
May's office said Saturday principles of an agreement had been reached, but the two sides later clarified that they are still talking.
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