The Week Ahead: Several party nominations on the line Tuesday night

The Senate-House conference committee ironing out differences in the competing versions of Wall Street reform legislation has a busy week, with three scheduled meetings. Some of the toughest issues remain.

Several party nominations will be decided Tuesday night after runoffs in South Carolina, North Carolina and Utah.

Work will also continue in the Senate on the tax extenders bill. In the House, there is expected to be a vote on campaign finance legislation.

Monday, June 21

-- President Barack ObamaBarack Hussein ObamaLet's not play Charlie Brown to Iran's Lucy Mattis dodges toughest question At debate, Warren and Buttigieg tap idealism of Obama, FDR MORE hosts a Father’s Day event at the White House. He’ll discuss the importance of responsible fatherhood and mentoring to build healthy families and communities, according to a statement on the event.

-- Vice President Joe BidenJoe BidenBiden bemoans white supremacy in remarks at civil rights movement site Gun control: Campaigning vs. legislating Sunday shows - Guns dominate after Democratic debate MORE will be in Midland, Mich., to discuss the Recovery Act. He’ll visit a manufacturing plant with Gov. Jennifer Granholm (D) and Sens. Carl LevinCarl Milton LevinStrange bedfellows oppose the filibuster Listen, learn and lead: Congressional newcomers should leave the extremist tactics at home House Democrats poised to set a dangerous precedent with president’s tax returns MORE (D-Mich.) and Debbie StabenowDeborah (Debbie) Ann StabenowConservatives offer stark warning to Trump, GOP on background checks USDA cuts payments promised to researchers as agency uproots to Kansas City USDA eases relocation timeline as researchers flee agency MORE (D-Mich.).

Tuesday, June 22

-- The Senate Foreign Relations Committee holds a 9:30 a.m. hearing on “Iran Policy in the Aftermath of U.N. Sanctions.”

-- The Senate-House conference committee on Wall Street reform meets at 11 a.m. It will meet Wednesday and Thursday at the same time.

-- Several runoff elections will conclude Tuesday night. In South Carolina, Nikki Haley will learn if she’ll be the Republican gubernatorial nominee. She won the June 8 primary by 22 points, but did not cross the 50 percent threshold needed to win the nomination outright. Haley came into the national spotlight after a conservative blogger claimed he had an affair with her — a charge she denied. She’s kept the support of several prominent conservatives, including former Govs. Sarah Palin (R-Alaska) and Mitt Romney (R-Mass.).

Also, Rep. Bob Inglis (R-S.C.) has a runoff for his seat. If he loses, he’ll be the fourth House member ousted in a primary this cycle.

-- In North Carolina, Democrats will decide their Senate nominee. Former state Sen. Cal Cunningham and Secretary of State Elaine Marshall are fighting for the chance to face Sen. Richard BurrRichard Mauze BurrLawmakers applaud Trump's ban on flavored e-cigarettes Trump to hold campaign rally in North Carolina day before special House election Hoekstra emerges as favorite for top intelligence post MORE (R-N.C.) in November. The latest polling showed Burr with a comfortable lead over either challenger.

-- In Utah, Republicans will decide who will replace Sen. Bob Bennett as their party’s nominee. Bennett lost at the state GOP convention and later endorsed Tim Bridgewater over Mike LeeMichael (Mike) Shumway LeeExclusive: Kushner tells GOP it needs to unify behind immigration plan Manufacturing group leads coalition to urge Congress to reauthorize Ex-Im Bank Overnight Defense: GOP grumbles after Trump delays military projects for wall | House panel hints at subpoena for Afghanistan envoy | Kabul bombing raises doubts about Taliban talks MORE. The winner of the nomination is expected to fill the seat in the conservative state.

Also in Utah, Rep. Jim MathesonJames (Jim) David MathesonTrump EPA eases standards for coal ash disposal Utah redistricting reform measure likely to qualify for ballot Trump's budget targets affordable, reliable power MORE (D) has a runoff, but he’s been spending big to hold off his challenger, political neophyte Claudia Wright.

-- Obama holds an LGBT Pride Month event at the White House.

Wednesday, June 23

-- The president hosts a bipartisan group of senators for talks on energy and climate legislation.

-- A House Science and Technology subpanel explores the issue of "Deepwater Drilling Technology, Research and Development” at 10 a.m.; the House Education and Labor Committee meets at the same time on worker health and safety on offshore oil rigs.

-- A Senate Appropriations subpanel holds a hearing at 10 a.m. on the reorganization of the Interior Department’s Minerals Management Service, the agency that oversees offshore drilling.

-- The Senate Rules and Administration Committee meets at 10 a.m. for a hearing on silent filibusters, holds and the Senate confirmation process.

-- First lady Michelle ObamaMichelle LeVaughn Robinson Obama2020 is not a family affair, for a change Former speechwriter says Michelle Obama came up with 'when they go low we go high' line CBC marks 400th anniversary of slaves' arrival in US MORE continues her outreach to government agencies with a visit to the Department of Justice, where she’ll be joined by Attorney General Eric HolderEric Himpton HolderEric Holder says Trump is subject to prosecution after leaving office Eric Holder: Democrats 'have to understand' that 'borders mean something' Trump lawyers ask judge to toss out Dems' tax return lawsuit MORE.

-- Director Oliver Stone speaks at a noon press conference on his latest film, "South of the Border," about Latin American political leaders.

Thursday, June 24

-- The Senate Health, Education, Labor and Pensions Committee holds a 10 a.m. hearing on federal investment in for-profit education.

-- The Health subcommittee of the House Veterans' Affairs Committee looks at the issue of “Overcoming Rural Health Care Barriers: Use of Innovative Wireless Health Technology Solutions" at 10 a.m.

-- The Senate Commerce Committee has a 10 a.m. hearing on Universal Service; a subcommittee meets at 2:30 p.m. on pipeline safety.

-- The first lady visits D.C.'s Duke Ellington School.

-- The Hill hosts a "Tribute to the Troops” breakfast policy briefing with Chairman of the Joint Chiefs of Staff Adm. Mike Mullen.

-- Obama hosts the Russian president, Dmitry Medvedev, at the White House.

Friday, June 25

-- Obama travels to Ontario, Canada, for the G-8 summit.

-- The Center for American Progress sponsors a forum called “Health Insurance Oversight in the Post-Reform World” from noon to 1:30 p.m., focusing on the creation of health exchanges and rate increase reviews.