Gingrich formally launched his campaign Wednesday via Twitter and followed up his announcement with a blistering interview on Fox News, accusing President Obama of employing "dishonest scare tactics" in an attempt to rally voters to his side.  

Gingrich ripped the White House response to Rep. Paul RyanPaul Davis RyanAmash storm hits Capitol Hill Debate with Donald Trump? Just say no Ex-Trump adviser says GOP needs a better health-care message for 2020 MORE's (R-Wis.) proposed budget and Obama's Tuesday speech on immigration reform, calling Obama's rhetoric "deliberately divisive."  

He also called for a new contract with America. Should he be the party's nominee against Obama next year, Gingrich said he would work with House Speaker John BoehnerJohn Andrew BoehnerK Street giants scoop up coveted ex-lawmakers Trump adviser expected to leave White House, join Juul The Hill's 12:30 Report: McGahn inflames Dem divisions on impeachment MORE and Senate Minority Leader Mitch McConnellAddison (Mitch) Mitchell McConnellThe Hill's 12:30 Report: Trump orders more troops to Mideast amid Iran tensions What if 2020 election is disputed? Immigration bills move forward amid political upheaval MORE to draft a "team contract."

Gingrich, meanwhile, picked up an early endorsement Thursday from Rep. Joe Barton (R-Texas) who said in an interview on C-SPAN's "Washington Journal" that Gingrich would make "a great president."

Barton is the first lawmaker to publicly endorse the former Speaker.

-Daniel Strauss contributed.