By Amanda Becker

WASHINGTON (Reuters) – The U.S. House of Representatives on Thursday approved a second bill in as many days to toughen background checks for gun purchases, but both bills were likely to face opposition from the Republican-controlled Senate and the White House.

The bills are the first major gun control measures approved in Congress in many years. They are an early move to address gun violence by Democrats after capturing majority control of the House in the November 2018 congressional midterm elections.

The Senate remains controlled by Republicans, many of whom are closely allied with the National Rifle Association (NRA) and gun-rights voters, who fiercely defend what they see as their constitutional right to own firearms.

While Republican President Donald Trump has said he supports stronger background checks, he has thus far toed the party line on gun control legislation, leaving Washington deadlocked on how to address frequent mass shootings in the United States.

From 2009 to 2017, there were at least 173 shootings in which four or more people were killed, with at least 1,001 total deaths, according to the advocacy group Everytown for Gun Safety.

Thursday’s background check bill would extend the number of days government authorities have to complete a background check before a gun sale. It passed by a 228-198 House vote.

Wednesday’s bill would expand background checks to include firearm purchases at gun shows and over the internet. It was approved 240-190. Both votes were largely along party lines.

The White House said on Monday that Trump’s advisers would recommend the president veto both pieces of legislation if they reached his desk because the first would impose “burdensome requirements” and the second “burdensome delays.”

The current background check process allows a gun purchase to proceed after three days, even if a background check has not been completed, said Democratic Representative James Clyburn from South Carolina, who sponsored Thursday’s bill.

He said that process resulted in 4,800 gun sales in 2017 to individuals with criminal records, a history of mental illness and other disqualifying circumstances.

“FBI analysis of the current background check system shows that 3 business days isn’t enough time to decide if someone shouldn’t be allowed to own a gun,” Clyburn said on Twitter.

His bill aims to close what Democrats call the “Charleston loophole” in the background check law by extending the window to complete a check to 10 days. They say the loophole allowed Dylann Roof to purchase the gun he used to kill nine people at a Charleston, South Carolina, church in 2015.

Representative Doug Collins, the top Republican on the House Judiciary Committee, where the background check bills originated, on Thursday called them “misguided” and said “my constitutional rights could be deferred indefinitely.”

(Reporting by Amanda Becker; Editing by Kevin Drawbaugh and Susan Thomas)