Rep. Charlie Dent Charles (Charlie) Wieder DentRepublican former Michigan governor says he's voting for Biden Biden picks up endorsements from nearly 100 Republicans Bush endorsing Biden? Don't hold your breath MORE (R-Pa.) says that President Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE's "lack of impulse control" is cause for concern, after a week of unpredictable moves by the White House left lawmakers uneasy about key Republican agenda items.

Dent told The Associated Press that Trump's off-script statements and responses have been a source of frustration for lawmakers in both parties, after the president suggested he might veto a key spending bill this week that the White House assured congressional leaders he would sign.

“The spontaneity and lack of impulse control are areas of concern for lots of members on both sides of the aisle,” said Dent, a frequent critic of the president. “Disorder, chaos, instability, uncertainty, intemperate statements are not conservative virtues in my opinion.”

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Trump mused on Twitter of a possible veto on the $1.3 trillion omnibus spending bill this week, a massive bipartisan legislative product that will fund the government for the rest of the fiscal year. Speaker Paul Ryan Paul Davis RyanKenosha will be a good bellwether in 2020 At indoor rally, Pence says election runs through Wisconsin Juan Williams: Breaking down the debates MORE (R-Wis.) personally met with Trump in a push to secure his support.

The president signed the bill Friday but warned Congress he would sign no such bills in the future that did not adequately fund increased border security while also significantly adding to the deficit.

Dent, who is not running for reelection in 2018, panned the president earlier this month for undercutting his own Cabinet officials, after Trump shook up the administration by ousting Secretary of State Rex Tillerson Rex Wayne TillersonGary Cohn: 'I haven't made up my mind' on vote for president in November Kushner says 'Alice in Wonderland' describes Trump presidency: Woodward book Conspicuous by their absence from the Republican Convention MORE.