Illinois Republican Rep. Peter Roskam quizzed Miller about a phone conversation he said he had with Lerner about the planned disclosure, which Miller said was intended to coincide with a disclosure to Congress.
He agreed with Roskam, however, that Congress wasn't told at the same time a question was 'planted' at the bar association conference.
'We called to try to get on the calendar' of the Ways and Means Committee,' Miller said.
'You called to try to get on the calendar?' Roskam asked, incredulous. 'Is that all you've got?'
'It's the truth,' Miller responded.
Under questioning from California Republican Rep. Devin Nunes, Miller said he would not commit to giving Congress his notes, phone records, and other evidence of conversations with Lerner.
Nunes reminded him that Congress could, and might, subpoena them.
In a stunning flashback moment, Louisiana Republican Rep. Charles Boustany played a video clip showing former IRS Commissioner Douglas Shulman testifying before the House Ways and Means Subcommittee on Oversight in March 2012.
'Can you give us assurances that the IRS is not targeting particular groups based on political leanings?' Boustany, the subcommittee's chairman, asked Shulman then.
'There's absolutely no targeting,' the then-commissioner responded in 2012. 'This is the kind of back-and-forth that happens when people apply for 501(c)(4) status.'
Asked Friday if this was a lie, Miller said 'It was incorrect.'
'But whether or not it was untruthful --' he continued, without reaching a conclusion.
'Why did you mislead Congress and the American people on this?' Boustany asked.
'Congressman, I did not mislead Congress or the American people,' Miller responded.
Paul Ryan, the Republicans' vice presidential nominee in 2012, slammed Miller for what he said was less-than-truthful testimony when he appeared before a subcommittee last year. Although he had been briefed by then about the problems with tax-exempt applications from tea party groups, he said nothing.
Miller hid material facts from Congress, Ryan said.
'How can we conclude that you did not mislead this committee?'
Miller fired back. 'I stand by my answers,' he said, saying that the word '"harassment" implies political motivation' on the part of IRS employees.
'There was no political motivation,' he insisted.