Asked about the meeting, Mr Trump said "politics is not the nicest business in the world" and it is standard for candidates to welcome negative information about an opponent. That act was named for Sergei Magnitsky, a Russian lawyer who exposed massive tax fraud in Russia at the government level.
Sen. Chuck Grassley (R-Iowa), chair of the Senate Judiciary Committee, said he is planning to ask Donald Trump Jr.to testify before his committee.
The Magnitsky Act, passed with bipartisan support in 2012, froze US assets of Russians purportedly involved in the detention and suspicious death of whistle-blowing attorney Sergei Magnitsky in a Russian prison in 2009.
However, the emails Donald Trump Jr received pitched her as one.
The civil forfeiture case was filed in 2013 by Preet Bharara, the former U.S. Attorney for the Southern District of NY - who was sacked by Trump in March.
But at a news conference Thursday, President Trump blamed the Obama administration for his son's meeting with Veselnitskaya, noting that it was President Obama's Attorney General who approved Veselnitskaya's entry into the U.S.in 2015.
Because of left-wing outrage and media obsession, the nation has focused on whether the Trump campaign colluded with Russians to influence the American election.More news: Triangle lines up for 80-cent doughnuts
Veteran Washington, D.C., lawyer Ty Cobb is the latest to join the president's legal team, a White House official said.
But the emails showed Trump Jr. appeared eager to accept information provided by the Russians as his father ran for the White House against Clinton.
"This is everything. This is everything", Trump Jr. responded.
'I think it would be a dereliction of duty not to give it an honest look, ' he said. That concern is "certainly something we want to explore", along with the Trump campaign's data analytics, Schiff said.
Trump also said in a tweet that his son was "open, transparent and innocent" and again dismissed the ongoing Russian Federation investigation as the "greatest Witch Hunt in political history".
US House of Representatives Speaker Paul Ryan on Thursday urged Trump's eldest son to testify to a congressional committee about the alleged links between Trump's election team and Russian Federation. "So in my opinion you had a member of Putin's secret police directly meeting with the son of the future next president of the United States asking to change U.S. sanctions policy crucial to Putin". She said that doing so could help Trump's campaign, Akhmetshin said. Trump Jr. then published the full email chain and released another statement.
He replied within minutes: "If it's what you say I love it especially later in the summer".
Watchdog groups filed a complaint against Donald Trump Jnr, Trump's son-in-law, Jared Kushner, and former campaign chief Paul Manafort on Thursday with the Federal Election Commission, which oversees elections, arguing the three violated the law by meeting with the Russian.