pac.dog pac.dog / Lobbying

Registration · 2026

Filing UUID
f6746549-ee0e-4f25-bceb-5e509285da4c
Type
RR — Registration
Period
second_quarter
Year
2026
Posted
2026-04-07 14:38:01
Income (reported)
Expenses (reported)
Filing document
Open on lda.senate.gov

Registrant (lobbying firm)

PIONEER PUBLIC AFFAIRS

Consulting and Government Affairs

Contact
JOSEPH BRITTON
Phone
+1 703-328-8016
Address
zip:20003, city:Washington, state:DC, street:700 Pennsylvania Avenue SE Suite 420

Client

MP MATERIALS CORP.

Rare earth materials producer

State
NV
Country
US
Effective date
2026-04-01

Issues lobbied + lobbyists

ENG — Energy/Nuclear

Advocate on issues relating to rare earth materials and critical minerals.

Lobbyists: JOSEPH BRITTON (covered position: Chief of Staff to Sen. Martin Heinrich; Deputy Chief of Staff & Legislative Director to Sen. Mark Udall; Legislative Assistant to Sen. Ben Nelson) [new]; ALEXANDER MCDONOUGH (covered position: Senior Policy Advisor, Senator Harry Reid) [new]; CARIANNE LEE (covered position: Senior Legislative Assistant, Rep. Bonnie Watson Coleman) [new]

DEF — Defense

Advocate on issues relating to rare earth materials and critical minerals.

Lobbyists: JOSEPH BRITTON (covered position: Chief of Staff to Sen. Martin Heinrich; Deputy Chief of Staff & Legislative Director to Sen. Mark Udall; Legislative Assistant to Sen. Ben Nelson) [new]; ALEXANDER MCDONOUGH (covered position: Senior Policy Advisor, Senator Harry Reid) [new]; CARIANNE LEE (covered position: Senior Legislative Assistant, Rep. Bonnie Watson Coleman) [new]

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