Former Vice President Joe Biden Joe BidenPelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Hillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns Fox News poll: Biden ahead of Trump in Nevada, Pennsylvania and Ohio MORE is holding on to his solid lead in the Democratic presidential primary, but Sen. Elizabeth Warren Elizabeth WarrenHillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns On The Money: Anxious Democrats push for vote on COVID-19 aid | Pelosi, Mnuchin ready to restart talks | Weekly jobless claims increase | Senate treads close to shutdown deadline Democratic senators ask inspector general to investigate IRS use of location tracking service MORE's (D-Mass.) support is ticking upward, according to a new Morning Consult survey.

Thirty-seven percent of Democratic primary voters said they supported Biden in the poll, marking a 1 percentage point slip in support for the former vice president.

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Warren's support, on the other hand, ticked up one point since last week. The same tracking poll showed Warren entering double-digit support earlier this month, putting her at third place behind Biden and Sen. Bernie Sanders Bernie SandersThe Hill's Campaign Report: Trump faces backlash after not committing to peaceful transition of power Bernie Sanders: 'This is an election between Donald Trump and democracy' The Hill's 12:30 Report: Trump stokes fears over November election outcome MORE (I-Vt.).

The Massachusetts senator has consistently unveiled a number of policy initiatives through the year and has seen her support steadily climb in the primary polls.

Biden has made fewer appearances on the campaign trail in recent weeks, but his name recognition is seen as having helped him maintain a solid lead in a crowded field of 24 Democrats in the primary.

The former vice president will touch down in Iowa on Tuesday and is slated to slam President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE in a speech to voters in the first-in-the-nation caucus state

A CNN–Des Moines Register poll released last week showed Biden's support in the Hawkeye State slipping by about a third to 24 percent from the initial survey.