Here are the 2 topics Mueller drilled down on in his questions to Trump

• The special counsel Robert Mueller focused on two key areas in his questions to President Donald Trump about potential Russian collusion.
• Mueller asked Trump about the Russian government's hack of the Democratic National Committee and whether he knew anything about it at the time.
• Mueller also asked the president whether he knew at the time about a June 2016 meeting at Trump Tower between top campaign officials and two Russian lobbyists offering dirt on then-Democratic candidate Hillary Clinton.
• The questions indicate Mueller is homing in on the pivotal time period between June and August 2016.

The special counsel Robert Mueller focused on two specific areas in his questions to President Donald Trump about potential collusion between the Trump campaign and Russia, according to Trump's lead defense lawyer.

Rudy Giuliani told Axios on Wednesday that Mueller asked about the Russian government's hack of the Democratic National Committee and then-Democratic nominee Hillary Clinton's campaign during the summer of 2016. He also reportedly asked the president whether he knew at the time about a June 2016 meeting at Trump Tower between his son, Donald Trump Jr., and two Russian lobbyists offering kompromat on the Clinton campaign.

Giuliani did not elaborate when asked about what specific questions the special counsel asked Trump, and he did not immediately respond to a request for comment from INSIDER. But his revelations indicate Mueller is homing in, specifically, on the period between June and August 2016, which was arguably the most pivotal time in the 2016 campaign season.

Mueller has long been focused on the Russian-backed campaign to hack into the DNC and distribute stolen emails via the Russia-linked hacker Guccifer 2.0 and the radical pro-transparency group WikiLeaks.

Trump has had no known contacts with WikiLeaks or Russians connected to the hack. But as a candidate, he expressed support for the group. He also famously made a public appeal directly to Russia during a July 27, 2016 press conference, saying he hoped they would be "able to find" the 33,000 emails Clinton deleted from her private server.

Meanwhile, Trump Jr. and the longtime GOP strategist Roger Stone, who was an informal adviser to the Trump campaign, were in direct contact with WikiLeaks during the election.

Both Trump Jr. and Stone have reportedly worried in recent days that they will soon be indicted by Mueller.

Trump Jr. arguably faces the most legal exposure from his involvement in the June 2016 Trump Tower meeting, which he attended with then campaign manager Paul Manafort and senior adviser Jared Kushner. Manafort pleaded guilty to conspiracy and obstruction earlier this year and is cooperating with Mueller.

When news of the meeting first surfaced last year, Trump Jr. said it was focused on the issue of "Russian adoptions" - which is related to the 2012 Magnitsky Act - and did not involve campaign business.

Later, it emerged that Trump Jr. took the meeting after he was offered dirt on Clinton, and that the meeting was pitched to him as "part of Russia and its government's support" for Trump's candidacy.

"I love it," Trump Jr. replied when he first got the offer from the British music publicist Rob Goldstone.

Trump and his lawyers have said the president had no knowledge of the meeting at the time.

But at least three Trump associates, including Giuliani, have hinted that he may know more than he's letting on about the meeting.

And in May, the Senate Judiciary Committee released testimony from Trump Jr. and Goldstone that raised additional questions about whether, and how much, Trump knew about the meeting in advance.

In particular, observers have pointed to a series of phone calls Trump Jr. made and received on June 6, after he got the offer.

Before taking the meeting, Trump Jr. told Goldstone he wanted to make sure it was legitimate and "just speak to Emin [Agalarov] first," referring to the Russian pop star with whom Goldstone worked and pitched the meeting on behalf of.

After talking to Goldstone, Trump Jr. got a phone call from Russia that lasted a minute or two. Then, he was in contact with a blocked number for three or four minutes. Immediately after ending that call, Trump Jr. called Agalarov back and the two spoke for a few minutes.

It's unclear who Trump Jr. spoke to in between his calls to Agalarov. But former Trump campaign manager Corey Lewandowski said Trump's private residence at Trump Tower has a blocked number.

In addition to questions about whether he knew about the meeting itself, Trump is also under scrutiny for his role in "dictating" an initially misleading statement Trump Jr. put out when news of the meeting first emerged last July. Prosecutors have said that if Trump knew the true purpose of the meeting and acted to conceal it, it could add to Mueller's growing obstruction case against him.

Trump's lawyers sent back their answers to Mueller's first round of questions on Tuesday.