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Watch Live: House Hearing on Flint Water Crisis

President Barack Obama declared a federal emergency in Flint, Mich. on Jan. 16 freeing up federal aid to help with lead-contaminated drinking water. (Bill Pugliano/Getty Images)

The House Oversight and Government Reform Committee holds a hearing on the lead-tainted water crisis in Flint, Mich.  

Officials from the Environmental Protection Agency and the City of Flint are among the witnesses expected to testify.  

Watch Live: Senate Hearing on Child Migrant Crisis

Protesters swarm buses carrying undocumented migrants for processing at the Murrieta Border Patrol Station in Murrieta, Calif. (David McNew/Getty Images)

The Senate Homeland Security and Governmental Affairs Subcommittee on Investigations holds a hearing on issues with procedures used by the Department of Health and Human Services to handle unaccompanied immigrant children arriving in the United States.

Officials from the Department of Health and Human Services are among the witnesses expected to testify.

Watch Live: Senate Hearing on Heroin and Prescription Drug Epidemic

Ayotte holds a heroin epidemic roundtable discussion at the Lakes Region General Hospital in Laconia , N.H., on Aug. 26, 2015. (Bill Clark/CQ Roll Call File Photo)

The Senate Judiciary Committee holds a hearing on the heroin and prescription drug abuse epidemic in the United States.

Vermont Gov. Peter Shumlin, New Hampshire Sens. Kelly Ayotte and Jeanne Shaheen, Ohio Sen. Rob Portman and other officials are among the witnesses expected to testify.

Watch Live: Senate Hearing on Obama Gun Control Actions

Lynch will testify on the White House's gun actions on Wednesday. (Bill Clark/CQ Roll Call File Photo)

The Senate Appropriations Subcommittee on Commerce, Justice, Science, and Related Agencies holds a hearing on President Barack Obama’s executive actions on gun control earlier this month.  

Attorney General Loretta Lynch, Alabama Attorney General Luther Strange and former Virginia Attorney General Ken Cuccinelli are among the witnesses expected to testify.  

Watch Live: Gov. Nikki Haley Gives GOP SOTU Response

Haley will deliver the GOP response to Obama's final State of the Union address. (Alex Wong/Getty Images)

Gov. Nikki R. Haley, R-S.C., delivers the Republican rebuttal to President Barack Obama’s final State of the Union address.

Coverage begins following the conclusion of Obama’s remarks.

Roll Call Presents: The 2016 State of the Union

Obama prepares to deliver his 2015 State of the Union address on Capitol Hill. (Mandel Ngan/AFP/Getty Images)

Roll Call presents the 2016 State of the Union, the final State of the Union address of Barack Obama’s presidency.

Coverage begins at 8:45 p.m. EST.