Sen. Marco Rubio (R-Fla.) on Monday said the bipartisan immigration reform bill he supports should be changed if the Boston Marathon bombings have revealed "flaws in the system."

NBC reporter Kelly O’Donnell tweeted Wednesday that Manchin told her “we will not get the votes today.”

New Interior Secretary Sally Jewell is tweeting about her enthusiasm for the job during her first full day at work.

Jewell said Monday on the social media site Twitter that she’s “honored & humbled” and “ready to get to work on behalf of all Americans.”

“I look forward to working w/ great employees @Interior, Congress & citizens to oversee our public lands & waters,” Jewell said in another tweet.

Former Rep. Gabrielle Giffords (D-Ariz.) thanked Arizona Sens. John McCain (R) and Jeff Flake (R) for voting to allow the Senate to debate gun control legislation on Thursday.

Proud of my senators @senjohnmccain & @jeffflake for voting yes to continued debate on reducing gun violence.Tucson deserves a vote.Thanks.

— Gabrielle Giffords (@GabbyGiffords) April 11, 2013

Secretary of State John Kerry will be collecting on a Twitter bet with Canadian Foreign Minister John Baird after the U.S. women's hockey team bested Canada in Tuesday's women's world hockey championship.

The daughter of the Sandy Hook Elementary School principal who was gunned down in December's massacre tweeted messages on Wednesday at the 14 Republican senators who have threatened a filibuster of the Senate gun bill.

Erica Lafferty said that only one — Sen. Ted Cruz (R-Texas) — responded, leading to a 20-minute phone conversation with the lawmaker.

“It was really just me asking him why he wasn’t doing his job,” Lafferty told MSNBC on Wednesday. “You know, the point of Congress is to debate and to vote and he’s choosing to not do that."

Former President Clinton has joined Twitter, with a little help from comedian Stephen Colbert.

In an interview taped over the weekend at the Clinton Global initiative and aired Monday night on Comedy Central, Colbert asked the former president about his online habits. Clinton noted that he rarely used email or social media, and did not have a Twitter account.

"Would you like to break into the 21st century right now, and send your first tweet?" Colbert asked, whipping out a smart phone.

Mike Tyson is launching a petition as he joins a bipartisan group of lawmakers in urging President Obama to posthumously pardon the first African-American world heavyweight champion, Jack Johnson.

Tyson created the Change.org petition Wednesday after meeting with Sen. Harry Reid (D-Nev.).

The majority leader, along with fellow Sens. John McCain (R-Ariz.) and Mo Cowan (D-Mass.) and Rep. Peter King (R-N.Y.), introduced legislation last month to pardon Johnson.

At the time, Reid — an amateur boxer in high school — said in a statement, “Johnson’s memory was unjustly tarnished by a racially-motivated criminal conviction, and it is now time to recast his legacy.”

Johnson, who died in 1946, was imprisoned for a year under the Mann Act, for crossing state lines with his white girlfriend.

In the petition, which garnered more than 700 supporters within hours of launching, the 46-year-old retired heavyweight champ writes, “I started this petition to keep the Jack Johnson pardon at the forefront of peoples minds. I am honored to do this for his legacy.”

The tweet, linking to a U.S. comedy show that mocked the Egyptian government's recent crackdown, sparked outrage from Egyptian officials.