WASHINGTON, Sept 28 (Reuters) - U.S. President Joe Biden on Tuesday insisted that lawmakers pass the full set of spending measures he proposed, making the case directly to members of his own party to fund not just infrastructure but his full agenda.

Biden used his heft as the leader of the Democratic Party to lean on lawmakers, including conservative members Senators Kyrsten Sinema and Joe Manchin, who have balked at the size of the spending packages under consideration.

Those meetings at the White House came as Congress wrestled over a $1 trillion roads, bridges and pipes bill that has drawn support from some Democrats and Republicans, as well as separate legislation making $3.5 trillion of investments in childcare, healthcare and housing.

"The American people sent a clear message at the polls last November," Biden said on Twitter after a meeting with Sinema ended without an apparent final agreement. "We need to meet this moment and deliver. We need to pass the Bipartisan Infrastructure Deal and my Build Back Better Agenda."

Jen Psaki, a spokesperson for Biden, told reporters after the meeting that the two Democrats had "agreed that we are at a pivotal moment" and on the "need to continue to work to finalize the path forward."

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The White House and Democratic leadership in both chambers privately tried to beat back concerns from Democrats about whether they stand on sufficiently firm political footing to pass both bills, as well as a set of emergency measures to keep the government from shutting down and defaulting on its debt.

Government funding is set to expire on Thursday and its borrowing authority is due to run out on Oct. 18.

A poll released by the Peter G. Peterson Foundation, a think tank, on Tuesday found bipartisan support for many of the tax increases Democrats have proposed to pay for the $3.5 trillion Build Back Better bill. Those measures include levies on companies' foreign income, increased Internal Revenue Service enforcement and a commitment to only raise taxes on people making more than $400,000 per year.

With the exception of some Senate Republicans breaking ranks to boost the infrastructure measure, they have largely lined up against Biden's spending agenda, as well as raising the nation's $28.4 trillion debt limit to pay for programs already passed by Congress.

Democrats, meanwhile, control the Senate and House of Representatives by only narrow margins and are divided on the best way to use that power before elections next year.

That has left Biden and his allies on Capitol Hill with the task of convincing virtually all of his party's delegation to support him.

Some Democratic lawmakers would prefer to support only the infrastructure measure. Others have said they would only support the infrastructure bill if the larger social spending bill is also passed.

"It would be a dereliction of duty for us to build the infrastructure of America without doing so in a manner that addresses the climate crisis significantly," said House Speaker Nancy Pelosi in a letter to colleagues. "To do so, we must pass the Build Back Better Act. As I write this to you, negotiations are being led by President Biden to advance his vision."

(Reporting by Susan Heavey, Nandita Bose, Susan Cornwell, David Morgan, Jarrett Renshaw and Trevor Hunnicutt; Writing by Trevor Hunnicutt; editing by Jonathan Oatis and Aurora Ellis)