MEMORANDUM **

Norman Klootwyk appeals pro se from the tax court’s order granting the Commissioner of Internal Revenue’s motion to dismiss Klootwyk’s petition contesting a Notice of Determination concerning income tax liabilities for tax years 1999 and 2000. We have jurisdiction under 26 U.S.C. § 7482(a)(1). We review for an abuse of discretion a tax court’s decision to dismiss a ease for lack of prosecution. Edelson v. Comm’r, 829 F.2d 828, 831 (9th Cir.1987). We affirm.

The tax court did not abuse its discretion in dismissing Klootwyk’s petition for failure to prosecute because Klootwyk failed to appear at trial, despite several warnings that failure to appear could result in dismissal of the petition. See id. (holding that the tax court did not abuse its discretion in dismissing the taxpayers’ petitions for failure to prosecute where the taxpayers had, among other things, failed to appear for trial).

We do not consider Klootwyk’s undeveloped contentions regarding the motions[*636] for sanctions and to strike. See Leer v. Murphy, 844 F.2d 628, 684 (9th Cir.1988) (“Issues raised in a brief which are not supported by argument are deemed abandoned.”).

Klootwyk’s remaining contentions are unpersuasive.

AFFIRMED.