LONDON-- The United Kingdom's Conservative and Liberal Democrats parties plan to meet Sunday as leading politicians work to resolve a national election that failed to yield an outright winner. Liberal Democrat leader Nick Clegg, whose party came in third after Thursday's voting, held meetings with fellow party members Saturday to discuss a possible deal with either of the two largest parties, Labour and the Conservatives. Clegg also met with Conservative leader David Cameron on Saturday night, local media reported. A broader meeting between Liberal Democrats and the Conservative Party is scheduled for Sunday morning, a Liberal Democrat spokeswoman told CNN. During a break in the talks with his own party, Clegg addressed hundreds of protesters in London who were demonstrating in favor of proportional representation, a system supported by the Liberal Democrats. If a deal cannot be done, Cameron made clear he was also prepared to try to rule as a minority Conservative government relying on support from smaller parties. The Conservatives have 306 lawmakers in the 650-seat House of Commons, compared to 258 for Labour and 57 for the Liberal Democrats.